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Shear strength characteristics of geosynthetic reinforced rubber-sand mixtures Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-21 D.R. Manohar; P. Anbazhagan
Shear strength characteristics of the geosynthetic-reinforced rubber-sand mixture (RSM) has been investigated by conducting Unconsolidated Undrained (UU) triaxial test. In the first part, a series of UU triaxial tests have been carried out to know the size effect of granulated rubber/tyre chips from seven different rubber sizes. RSM sample that provides higher strength, energy absorption capacity and
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Influence of bio-clogging on permeability characteristics of soil Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-19 Yu Zhang; Qiang Tang; Peixin Shi; Takeshi Katsumi
It is necessary to enhance the barrier performance of cutoff walls in order to improve the contamination control level, especially for reconstruction or expansion of existing landfill sites. This paper presents a comprehensive laboratory investigation on the synergistic effects of microorganisms and fibers on the hydraulic conductivity of silty sand to evaluate the applicability to the field condition
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A simple unified stress-strain model for geotextile-wrapped soils Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-19 Chaomin Shen; Kewei Fan; Sihong Liu; Liujiang Wang; Zhiqiang Lai; Weihai Yuan
The stress-strain behaviour of geotextile-wrapped soils is a matter of great concern in geotechnical engineering practices. In this study, a unified stress-strain model for geotextile-wrapped soils is proposed and is applied to understand the strength and deformation characteristics of soilbags (woven bag-wrapped soils) in 2D biaxial loading. It is demonstrated that the strength of wrapped soils is
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Numerical evaluation of the effect of foundation on the behaviour of reinforced soil walls Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-19 S.H. Mirmoradi; M. Ehrlich; L.F.O. Magalhães
This study numerically investigates the influence of foundation conditions, in combination with other factors such as wall height and reinforcement and facing stiffness, on the behaviour of reinforced soil walls (RSWs) under working stress conditions. The foundation was simulated using different stiffnesses and geometries (with and without slope). The results highlight the importance of the combined
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A simple design approach to analyse the piled embankment including tensile reinforcement and subsoil contributions Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-19 Yan Zhuang; Xiao-Yan Cui; Kang-Yu Wang; Jun Zhang
There is not one generally accepted approach for the design of geogrid-reinforced pile-supported (GRPS) embankments. Relevant mechanisms include arching of the embankment material, but also the effect of geogrid reinforcement and potentially a contribution from the underlying subsoil. This paper presents a simple design approach to identify the contribution of all three mechanisms, in which the contribution
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The effects of porosity, asphalt content and fiberglass incorporation on the tensile strength and resilient modulus of asphalt concrete blends Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-14 Guilherme Pepplow Piuzzi; Hugo Carlos Scheuermann Filho; Joe Arnaldo Villena Del Carpio; Nilo Cesar Consoli
Asphalt concrete is the prevailing material used for road surface construction. Its adequate characteristics in providing stability, durability and driving safety are controlled by complex interactions between its components. Thus, it is important to estimate the sensitivity of asphalt concrete mechanical properties as a function of its volumetrics. For this study, different combinations between asphalt
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Failure mechanisms of geosynthetic clay liner and textured geomembrane composite systems Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-13 Shahin Ghazizadeh; Christopher A. Bareither
The objective of this study was to evaluate shear behavior and failure mechanisms of composite systems comprised of a geosynthetic clay liner (GCL) and textured geomembrane (GMX). Internal and interface direct shear tests were performed at normal stresses ranging from 100 kPa to 2000 kPa on eight different GCL/GMX composite systems. These composite systems were selected to assess the effects of (i)
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Laboratory evaluation of interfacial mechanical properties in geogrid-reinforced bituminous layers Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-13 Ehsan Solatiyan; Nicolas Bueche; Alan Carter
In this study, the mechanical properties of composite bituminous structures with geogrid products, used as an interlayer between different types of bituminous mixtures, at a constant temperature, were examined. A twofold experimental program based on new approaches was selected. A new configuration of the 3-Point Bending Test (3-PBT) was adopted to capture the J-integral and crack resistance property
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Performance of polyurethane seismic buffers in reducing earth pressure: An experimental study Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-09 Iman Golpazir; Abbas Ghalandarzadeh
This paper investigates the effect of seismic buffers made of flexible polyurethane (PU) foam on the seismic response of a non-yielding retaining wall. A series of shaking table tests were conducted on three types of seismic buffers: pure PU foam (9 cm thick), pure PU foam (4.5 cm thick), and a mixture of PU foam and sand (15% foam and 85% sand by mass). A control test also was carried out on a similar
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Static stability analysis of geocell-reinforced slopes Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-08 Nariman Khorsandiardebili; Mahmoud Ghazavi
This paper presents an analytical approach to investigate the stability of geocell-reinforced slopes using the limit equilibrium method (LEM). The so-called Horizontal Slice Method (HSM) is employed to simulate horizontal geocell layers. Each geocell layer acts as a beam providing bending and shear resistance in addition to axial strength. A formula is devised by picking relevant governing equilibrium
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Filtration performance of geotextile encasement to minimize the clogging of stone column during soil liquefaction Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-08 Suravi Pal; Kousik Deb
Stone columns, which are frequently employed to stabilize the liquefiable soil, are susceptible to accumulation of soil particles. The progressive accumulation of the soil particles causes clogging of the stone column which decreases its drainage capacity. The stone column can be encased with geotextile to sustain its long term drainage function. The encasement prevents the movement of the soil particles
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Modified stress and temperature-controlled direct shear apparatus on soil-geosynthetics interfaces Geotext. Geomembr. (IF 3.4) Pub Date : 2021-01-02 Zhiming Chao; Gary Fowmes
In this paper, a bespoke stress and temperature controlled direct shear apparatus to test soil-geosynthetics interfaces is introduced. By adopting the apparatus, a series of ‘rapid loading’ shear tests and creep tests were conducted on the Clay – Geosynthetic Drainage layer (GDL) interfaces to assess the functionality of the apparatus. The experimental results indicate that, the modified apparatus
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Field study and numerical modelling for a road embankment built on soft soil improved with concrete injected columns and geosynthetics reinforced platform Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-31 Balaka Ghosh; Behzad Fatahi; Hadi Khabbaz; Huu Hung Nguyen; Richard Kelly
Generally numerical modelling can provide an accurate and cost-effective approach to understand the behaviour of geosynthetic-reinforced column-supported embankment. When the problem geometry cannot be simplified to the two-dimensional plane-strain or axisymmetric, a full three-dimensional solution is required to obtain sensible results. This study presents a modelling of the geosynthetic-reinforced
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Large scale soft ground consolidation using electrokinetic geosynthetics Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-31 Yan-feng Zhuang
Field test of electro-osmotic consolidation with area of 800 square meters was carried out using electrokinetic geosynthetics (EKG). By introducing this field test, new concepts and solutions of difficulties in large scale application of electro-osmosis is introduced. Strategies of building smart DC power source to meet the large current intensity requirement of electro-osmosis are introduced. Roll
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Geosynthetics reinforced interposed layer to protect structures on deep foundations against strike-slip fault rupture Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-31 Habib Rasouli; Behzad Fatahi
In the present study, the interaction mechanism of a 10-story moment-resisting building frame sitting on the conventional piled raft foundation with a strike-slip fault rupture with a dip angle of 90̊ is studied via three-dimensional finite element numerical simulation using ABAQUS. In addition, an alternative composite foundation system with geosynthetics reinforced interposed layer between piles
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A shakedown limit calculation method for geogrid reinforced soils under moving loads Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-30 D.P. Connolly; H.S. Yu
A method to calculate the elastic shakedown limit of transportation systems (e.g. pavements and railways) supported by geogrid reinforced soils is presented. For the first time, lower-bound shakedown theory is combined with a strength-based geogrid simulation approach, resulting in a rapid method to quantify the benefit of geogrids on the elastic shakedown limit. It allows decoupling of elastic stress
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Shaking table tests on polymeric-strip reinforced-soil walls adjacent to a rock slope Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-29 Ali Komak Panah; Zakieh Eftekhari
This research adopts the approach to constructing reinforced-soil walls on rock slope, where the extent of reinforced zone has to be constrained since excavation of the relatively rigid zone may not be economical and may disrupt the traffic. To examine the seismic behavior of these structures, a series of 1-g shaking table tests using variable-amplitude harmonic excitations was conducted on 0.8m-high
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Physical model studies on damage and stability analysis of breakwaters armoured with geotextile sand containers Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-29 Tom Elias; Kiran G. Shirlal; Kajal E.V.
Harnessing the advantages of geotextile sand containers (GSCs), numerous submerged breakwaters and shoreline protection structures have been constructed worldwide. But an emerged breakwater structure with geotextile armour units, capable of replacing the conventional structures, is rarely discussed. A 1:30 scaled physical experimentation is chosen as a preliminary investigation to test the feasibility
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Model tests of freeze-thaw behavior of geocell-reinforced soils Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-29 Mian Huang; Cheng Lin; Sanat K. Pokharel; Armando Tura; Phalguni Mukhopadhyaya
Freeze-thaw cycles are a major cause for destabilizing pavements in cold regions. Among countermeasures for freeze-thaw damages, use of geocells to reinforce pavement bases is an effective solution in practice. However, as opposed to widespread applications, research concerning freeze-thaw behavior of geocell-reinforced bases is limited, probably due to a lack of proper devices for conducting experimental
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Three-dimensional finite element analysis of geosynthetic-reinforced soil walls with turning corners Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-25 C. Hung; C.H. Liu; H. Liu
The paper presents in-depth three-dimensional finite element analyses investigating geosynthetic-reinforced soil walls with turning corners. Validation of the 3D numerical procedure was first performed via comparisons between the simulated and reported results of a benchmark physical modeling built at the Royal Military College of Canada. GRS walls with corners of 90°, 105°, 120°, 135°, 150°, and 180°
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Pullout behavior of geosynthetic reinforcement in biocemented soils Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-25 YuFeng Gao; Lei Hang; Jia He; Fei Zhang; Leon Van Paassen
The pullout resistance of a geosynthetic reinforcement is crucial for the design of reinforced soil structures. In this paper, an innovative concept, biocementation-geosynthetic (BG) system is presented, in which biocementation is used in combination with geosynthetic to increase the pullout resistance of the geosynthetic reinforcement. A series of pullout tests were conducted in laboratory to obtain
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Shaking table performance of reinforced soil retaining walls with different facing configurations Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-17 Peng Xu; Kianoosh Hatami; Guanlu Jiang
In this paper, a new type of MSE wall facing, termed as hybrid facing, is introduced and studied, which is built using a combination of concrete modular blocks and cast-in-place concrete. Two shaking table tests were carried out to compare seismic performances of model reinforced soil retaining walls with full-height vs. hybrid facing configurations. Results of this study show that the stability and
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Dynamic shear behavior of GMB/CCL interface under cyclic loading Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-17 Shi-Jin Feng; Jia-Liang Shi; Yang Shen; Hong-Xin Chen; Ji-Yun Chang
The dynamic shear behavior of composite liner interface is of great importance for landfill seismic analysis. In this study, an experimental investigation of the shear behavior of the interface between smooth high density polyethylene (HDPE) geomembrane (GMB) and compacted clay liner (CCL) is presented. A series of displacement-controlled cyclic shear tests were conducted to investigate the effects
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Comparison and evaluation of analytical models for the design of geosynthetic-reinforced and pile-supported embankments Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-16 Tuan A. Pham; Daniel Dias
Geosynthetic-reinforced and pile-supported (GRPS) embankments are becoming more and more popular as this technique showed good performances in practice. Various design methods were introduced to analyze GRPS embankments. However, the applicability of these design methods was not always fully validated. This paper focuses on the review of projects containing field observations of GRPS embankments. The
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Geosynthetic-reinforced soils above voids: Observation of soil and geosynthetic deformation mechanisms Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-31 T.S. da Silva Burke; M.Z.E.B. Elshafie
Understanding how a geosynthetic-reinforced soil deforms in response to the formation of an underlying void is crucial to provide appropriate designs of these systems. Centrifuge models employing a trapdoor to simulate the void formation below a geosynthetic-reinforced sand were conducted to investigate the behaviour in a controlled environment at realistic stress levels. The plane-strain models allowed
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Experimental investigation of a reinforced soil retaining wall with a flexible geogrid-wrapped ecological bag facing Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-06 Junyi Duan; Guolin Yang; Yuliang Lin; Xinting Cheng; Zhihao Dai
This paper presented a field study of the reinforced soil wall (RSW) with a geogrid wrap-around facing. In addition to the conventional monitoring content, the strain of the face-wrapping geogrid, which was neglected in most previous studies, was monitored during the construction process. The positional relationship between the maximum vertical earth pressure and horizontally laid geogrid strain was
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Examining metal migration through geotextiles during dewatering Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-31 H.A. Tackley; C.B. Lake; M. Alimohammadi
This paper presents a study conducted to assess the influence that a filter cake deposited on the surface of the geotextile has on the mobility of three metals (Cu, Pb, Zn) during filtration of a contaminated sediment. Two chemical additives (cationic coagulant and cationic polymer) were introduced to the sediment to increase the particle size and improve the filtration efficiency. Bench scale experimentation
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Experimental study on the multi-impact resistance of a composite cushion composed of sand and geofoam Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-14 Peng Zhao; Song Yuan; Liangpu Li; Qi Ge; Jun Liu; Longhuan Du
In the case of the rockfall hazards, multiple rockfall impacts usually occur. To improve the ductility and the multi-impact resistance ability of the rock-shed, geofoam is proposed to replace part of sand, forming a composite cushion. Two types of geofoam are selected in the paper, namely, expandable polyethylene (EPE) and expanded polystyrene (EPS). A systematic experimental study was conducted to
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Modified Broms’ method for formation of working platform on very soft soil Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-15 Hao Chen; Jian Chu; Wei Guo; Kok Pang Lam
Construction over soft soil is a challenge as the ground can be too soft to work on it. To overcome this, a working platform has to be formed before any soil improvement work can be carried out. One of such methods was proposed by Broms (1987) which uses geotextile and sand berms. In this paper, a modified Broms' method is proposed to use geotextile tubes to confine the sand berms. A new analytical
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Full scale consolidation test on ultra-soft soil improved by prefabricated vertical drains in MAE MOH mine, Thailand Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-28 Dong Huy Ngo; Suksun Horpibulsuk; Apichat Suddeepong; Wisanukorn Samingthong; Artit Udomchai; Prajueb Doncommul; Arul Arulrajah; Myint Win Bo
The reclamation of slurry pond with ultra-soft soil deposit using the prefabricated vertical drains (PVDs) with preloading technique in the Mae Moh mine, Lampang, Thailand is a challenging work and is illustrated in this paper. Geotextile reinforcement was used to strengthen bearing capacity of the soil foundation prior to the installation of sand platform. The delay of excess pore water pressure dissipation
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Laboratory test and modelling of gas pressure under geomembrane subjected to the rise of groundwater in plain reservoirs Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-19 Liujiang Wang; Sihong Liu; Chaomin Shen; Yang Lu
To investigate the development of pore pressures in the air-confined system with a rise of groundwater under a geomembrane, a laboratory test was conducted. Then, a numerical model with the consideration of the water-gas-solid three-phase system was developed based on the hydro-mechanical coupling theory for unsaturated soils. The model was validated by the experimental result and then a numerical
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Experimental study of the performance of geosynthetics-reinforced soil walls under differential settlements Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-06 Liang Lu; Shuwen Ma; Zongjian Wang; Yi Zhang
The deformation performance and settlement failure mechanism of geosynthetics-reinforced soil (GRS) walls are the two key points of engineering design under the differential settlement. This paper presents model tests of deformation performance and failure mechanism of the GRS wall with and without lateral restriction under differential settlement conditions. The observation and measurement results
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Experimental study on vacuum preloading consolidation of landfill sludge conditioned by Fenton's reagent under varying filter pore size Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-14 Yajun Wu; Yang Xu; Xudong Zhang; Yitian Lu; Guang Chen; Xiaodong Wang; Binjie Song
In view of the deep dewatering of landfill sludge (LS) that had been buried for more than ten years in Shanghai, Fenton's reagent combined with a vacuum preloading method was proposed. First, a vacuum filtration test was carried out to study the optimal amount of Fenton's reagent for LS. Then, four filter membranes with different pore sizes were used for a vacuum preloading model box test to study
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Experimental investigation on the performance of multi-tiered geogrid mechanically stabilized earth (MSE) walls with wrap-around facing subjected to earthquake loading Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-07 Amir Mohsen Safaee; Ahmad Mahboubi; Ali Noorzad
Construction of mechanically stabilized earth (MSE) walls in multi-tiered configurations is a promising solution for increasing the height of such walls. The good performance of this type of walls after recent major earthquakes was reported in a number of technical studies. In the present study, an experimental approach was adopted to compare the seismic performance of single-tiered and multi-tiered
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Stress-dependent method for calculating the modulus improvement factor in geocell-reinforced soil layers Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-04 R.S. Garcia; J.O. Avesani Neto
This paper presents an analytical method for determining the modulus improvement factor (MIF) in geocell-reinforced soil layers. Using a modified version of the hyperbolic soil model as a constitutive model, the method is developed based on the soil-reinforcement interaction relating nonlinear elastic soil behavior to the linear elastic response of the reinforcement. The proposed method, in an original
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Design of geosynthetic reinforced column supported embankments using an interaction diagram Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-21 Louis King; Daniel King; Abdelmalek Bouazza; Joel Gniel; R. Kerry Rowe
Geosynthetic reinforced column supported embankments predominantly utilise two mechanisms to transfer embankment loads towards column heads, soil arching and membrane actions. When undertaking the design of column supported embankments, it is common practice to perform a two-step design, whereby the arching actions are estimated independently of the subsoil deformation and membrane actions. This approach
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Study on filtration process of geotextile with LBM-DEM-DLVO coupling method Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-21 Silin Wu; Yilin Chen; Yuyang Zhu; Pei Zhang; Alexander Scheuermann; Guangqiu Jin; Wei Zhu
The method of filtering and dewatering waste slurry using geotextiles has been widely used in recent years. It is important to adopt suitable geotextiles to get a high dewatering rate and a high retention performance. In view of the unclear influence of the geotextile properties on the cake and the unclear soil particle retention mechanism in geotextiles, this paper uses the Lattice Boltzmann method-Discrete
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Hydration/dehydration behaviour of geosynthetic clay liners in the Antarctic environment Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-06 Genaro Gonzalo Carnero-Guzman; Abdelmalek Bouazza; Will P. Gates; R. Kerry Rowe; Rebecca McWatters
This paper examines the hydration/dehydration behaviour of geosynthetic clay liner (GCL) under polar conditions for four simulated conditions experienced at Australia's Casey Station in Antarctica: (a) hydration during summer, (b) dehydration during a winter-summer cycle, (c) hydration through a fine Antarctic soil, and (d) hydration through a coarse Antarctic soil. Hydration during the summer is found
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Centrifuge modeling of geosynthetic-encased stone column-supported embankment over soft clay Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-28 Jian-Feng Chen; Liang-Yong Li; Zhen Zhang; Xu Zhang; Chao Xu; Sathiyamoorthy Rajesh; Shou-Zhong Feng
Geosynthetic-encased stone column (GESC) has been proven as an effective alternative to reinforcing soft soils. In this paper, a series of centrifuge model tests were conducted to investigate the performance of GESC-supported embankment over soft clay by varying the stiffness of encasement material. The enhancement in the performance of stone columns encased with geosynthetic materials was quantified
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Performance of polypropylene textile encased stone columns Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-13 Deendayal Rathod; Mohammed Shakeel Abid; Sai K. Vanapalli
This paper explores the potential use of a woven polypropylene textile for encapsulating stone columns and improving performance of a local soft soil in Warangal city of India. A series of axial load tests were performed on stone columns of various diameters and under various encapsulation conditions that include single and double layers and other combinations. Load carrying capacity of stone column
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Geosynthetic reinforced piled embankment modeling using discrete and continuum approaches Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-12 Quoc Anh Tran; Pascal Villard; Daniel Dias
Understanding the load transfer mechanism can support engineers having more economical design of geosynthetic reinforced piled embankments. This study aims to investigate the load transfer mechanisms by two different numerical methods including the Discrete Element Method (DEM) and the Finite Difference Method (FDM). The DEM model adopts (a) discrete particles to simulate the micro-structure of the
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The characterisation of geosynthetic interface friction by means of the inclined plane test Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-16 P. Pavanello; P. Carrubba; N. Moraci
The paper focuses on the evaluation of the shear strength in conditions of low normal stress of various geosynthetic-geosynthetic interfaces, which are typical of landfill cover systems, by means of the inclined plane test, with the aim of studying the friction mobilisation in relation to various kinematic behaviours. The results of three different methods to evaluate the angle of friction were analysed
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Microanalysis of smooth Geomembrane–Sand interface using FDM–DEM coupling simulation Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-27 Wei-Bin Chen; Tao Xu; Wan-Huan Zhou
Very limited attention was paid on the micro–response of sand as it interacts with geomembrane and the effect of surface hardness on the interaction at the microscopic level. In this study, a coupled finite difference–discrete model was adopted with which to analyze the shear behavior of sand–smooth geomembrane interface. The model was validated using published experimental data. The numerical results
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Numerical parametric study of geosynthetic reinforced soil integrated bridge system (GRS-IBS) Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-25 Allam Ardah; Murad Abu-Farsakh; George Voyiadjis
A 2-D finite flement model was developed in this study to conduct a FE parametric study on the effects of some variables in the performance of geosynthetic reinforced soil integrated bridge system (GRS-IBS). The variables investigated in this study include the effect of internal friction angle of backfill material, width of reinforced soil foundation (RSF), secondary reinforcement within bearing bed
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A simple solution for prefabricated vertical drain with surcharge preloading combined with vacuum consolidation Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-24 Trong Nghia Nguyen; Dennes T. Bergado; Mamoru Kikumoto; Phuoc H. Dang; Salisa Chaiyaput; Phu-Cuong Nguyen
Prefabricated vertical drains (PVDs) with the surcharge preloading and vacuum consolidation has become considerably popular for ground improvement projects. A simple solution that incorporates the fundamental embankment features, such as the average degree of consolidation and excess pore pressure, are essential for the design of soft ground improvements by PVDs with vacuum preloading. However, most
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Soil-reinforcement interaction: Stress regime evolution in geosynthetic-reinforced soils Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-29 Amr M. Morsy; Jorge G. Zornberg
Understanding the stress regime that develops in the vicinity of reinforcements in reinforced soil masses may prove crucial to understanding, quantifying, and modeling the behavior of a reinforced soil structures. This paper presents analyses conducted to describe the evolution of stress and strain fields in a reinforced soil unit cell, which occur as shear stresses are induced at the soil-reinforcement
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One-step analytical method for required reinforcement stiffness of vertical reinforced soil wall with given factor of safety on backfill soil Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-03 Lei Wang; Chunhai Wang; Huabei Liu; Ching Hung
The selection of geosynthetic reinforcements in the design of geosynthetic-reinforced soil (GRS) retaining walls has been based on the requirement on the long-term strength. However, the mobilized loads in the reinforcements are related to both the reinforcement stiffness and soil deformation, and the desired factor of safety may not exist in the earth structure if they are not properly considered
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An analytical model for particle-geogrid aperture interaction Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-20 Chuhao Liu; Buddhima Indraratna; Cholachat Rujikiatkamjorn
The shear strength of geogrid-reinforced ballast is often dependent on the aperture size of geogrids and the nominal size of ballast. This paper presents a theoretical analysis based on probabilistic mechanics of how aperture size affects the interaction between particles and geogrid. Unlike past literature, in this study, the properties of the particle size distribution is analysed using a Weibull
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Performance of a 33m high geogrid reinforced soil embankment without concrete panel Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-14 Mincai Jia; Wenkai Zhu; Chao Xu
Geosynthetic reinforced soil embankment are extensively applied in the construction of high-speed railway and highway in mountainous regions but limited field monitoring is conducted on high and steep cases. Aiming to acquire better understanding, a 33-m-high single-tiered wrapped-facing geogrid reinforced soil embankment with the slope of 1 V:0.5H in China was monitored for 2 years during and after
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Influence of geosynthetic reinforcement on the stability of an embankment with rigid columns embedded in an inclined underlying stratum Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-02 Gang Zheng; Xiaoxuan Yu; Haizuo Zhou; Xinyu Yang; Wei Guo; Pengbo Yang
Incompressible dipping substrata are commonly encountered in engineering practice. Compared to horizontal underlying strata, the inclined underlying stratum increase the risk of collapse of embankments reinforced with columns because it weakens the restraint of the column base. The objective of this study is to investigate the effectiveness of geosynthetics on improving the embankment stability when
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Shear behavior of geocell-geofoam composite Geotext. Geomembr. (IF 3.4) Pub Date : 2020-10-24 Mohammad Reza Arvin; Masoud Abbasi; Hossein Khalvati Fahliani
In design, internal stability of EPS lightweight fills are provided either by applying load distributing mechanisms (thick pavements or concrete slabs) or using more strong lightweight material through denser EPS geofoam blocks. However, unit weight of the EPS geofoam is a limited parameter. As an attempt to improve the mechanical properties of EPS geofoam, geocell-geofoam composite (GGC) is introduced
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Cyclic shear behavior of GMB/GCL composite liner Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-13 Ji-Yun Chang; Shi-Jin Feng; Qi-Teng Zheng; Yang Shen
The composite liner system consisting of geomembrane (GMB) and geosynthetic clay liner (GCL) has been widely used in landfills. Although there have been a lot of studies on the monotonic shear behavior of GMB/GCL composite liner, the dynamic test data are still very limited and consequently, the dynamic shear mechanism is not clear. A series of displacement-controlled cyclic shear tests were conducted
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Centrifuge model tests on the deformation behavior of geosynthetic-encased stone column supported embankment under undrained condition Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-10 Liang-Yong Li; Sathiyamoorthy Rajesh; Jian-Feng Chen
A series of centrifuge model tests were carried out to investigate the performance of geosynthetic-encased stone columns (GESCs) supported embankment under undrained condition. The influence of stiffness of encasement, basal reinforcement and embankment loading on the deformation behavior of GESCs were also assessed. The centrifuge test results reveal that under undrained condition, compared to ordinary
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Effect of unequal biaxial tensile strains on the filtration behaviour of continuous filament needle-punched nonwoven geotextiles Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-09 Lin Tang; Yan Wang; Yi Wang; Xiao-Wu Tang; Pei-Mian Du
The effect of unequal biaxial tensile strains on the filtration behaviour of continuous filament needle-punched nonwoven geotextiles was investigated via gradient ratio tests. The filtration behaviour of four groups of unequal biaxial tensile strains were examined, including the gradient ratio (GR), permeability of the soil-geotextile system, mass of soil loss, and permittivity of pure geotextiles
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Numerical investigation of reinforcement pullout resistance effects on behavior of geosynthetic-reinforced soil (GRS) piers Geotext. Geomembr. (IF 3.4) Pub Date : 2020-12-04 Panpan Shen; Jie Han; Chao Xu
In this study, three-dimensional numerical analyses were carried out to investigate the effects of reinforcement pullout resistance including facing connection strength on the behavior of geosynthetic-reinforced soil (GRS) piers under a service load condition. Three different piers were investigated in this study, which simulated different levels of reinforcement pullout resistance. Each pier had two
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Performance of multicomponent GCLs in high salinity impoundment applications Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-24 R. Kerry Rowe; A.Y. AbdelRazek
The interface transmissivity (θ) of two multicomponent geosynthetic clay liners (GCLs) is investigated upon hydration and permeation with a highly saline solution (TDS ≈ 260,000 mg/l; Na+ ~ 95,000 mg/l; K+~12,000 mg/l) at two stress levels (10 kPa and 150 kPa). One GCL had a smooth 0.2 mm-thick coating whereas the second GCL had a textured 1 mm-thick coating. For both GCLs, the interface transmissivity
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Suction and crack propagation in GCLs subjected to drying and wetting in CaCl2-solutions Geotext. Geomembr. (IF 3.4) Pub Date : 2020-09-25 Wolfgang Lieske; Florian Christ; Wiebke Baille; Gemmina Di Emidio; Torsten Wichtmann
The current study addresses the cracking and self-healing capacity of Geosynthetic clay liners (GCLs) subjected to drying and wetting in a divalent salt solution. Commercially available GCLs, initially saturated under a load of 3.92 kPa, were stepwise dried for different durations in an oven at 30 °C and rewetted afterwards in deionised water and divalent salt solutions (CaCl2) of different molarities
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Evaluation of silt curtain in the reduction of suspended solids Geotext. Geomembr. (IF 3.4) Pub Date : 2020-09-13 Eduardo Paniguel Oliveira; Rafael Brito de Moura; Caio Pompeu Cavalieri; Rafael de Oliveira Tiezzi
Turbidity curtains, also called as turbidity barriers and silt curtains, were designed to contain plumes of suspended solids in water bodies. The high concentration of suspended solids in the raw water impacts on the costs of its treatment. Water with higher turbidity requires more coagulants in water treatment and needs a sludge management. In order to reduce turbidity in the water intake, the present
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A DEM analysis of geomembrane-lined landfill subject to vertical loading Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-12 Juan Hou; Hao Li; Lei Liu; Shihan Wang; Yuyang Teng; Shifen Bao
Particle flow code in three dimensions (PFC3D) is used to investigate the bearing capacity and mechanism of a geomembrane-lined landfill under construction loading. The soils and the geomembranes are simulated by numerous balls and parallel bond, respectively. The initial states and loading processes of geomembrane-lined soil are simulated by PFC3D method. The displacement vector diagram, the velocity
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Field behaviors of a geogrid reinforced MSW slope in a high-food-waste-content MSW landfill: A case study Geotext. Geomembr. (IF 3.4) Pub Date : 2020-11-03 Han Ke; Pengcheng Ma; Jiwu Lan; Yunmin Chen; Haijie He
A one-year field monitoring of a geogrid reinforced municipal solid waste (MSW) slope was conducted in the Xingfeng Landfill. Settlement tubes, strain gauges and earth pressure cells were used to measure the vertical settlement, the reinforcement strains and the vertical earth pressures in the reinforced MSW slope, respectively. During the monitoring period, the waste sliding occurred and the fresh
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