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Effect of oxidative ageing on stiffness improvement factor for HDPE and PET geogrids Geosynth. Int. (IF 4.5) Pub Date : 2023-11-22 M. S. Morsy, A. M. Elhanafy, S. S. Fathelbab, S. M. Ahmed
The effect of thermal-oxidative ageing on the in-isolation and in-soil stiffness is investigated for two high-density polyethylene (HDPE) and two polyester (PET) geogrids when incubated in an oven at 90oC. It is shown that the in-isolation and in-soil stiffness of three out of the four geogrids decreased during the 4-month ageing time with a faster degradation of the two PET geogrids. In contrast,
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Equivalent analytical models for assessment of landfill composite liners Geosynth. Int. (IF 4.5) Pub Date : 2023-11-21 H. Xie, W. Xu, L. Wang, H. Yan, J. Wu
In order to efficiently estimate the properties of landfill composite liners, equivalent analytical models based on time moment are proposed. The service performance of geomembrane layer (GMBL)/geosynthetic clay layer (GCL)/attenuation layer (AL) and GMBL/compacted clay layer (CCL)/AL are equivalent analyzed. The equivalent analysis and quantitative correlation of contaminants at the bottom of GMBL/GCL/AL
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Combined bearing capacity of footings on geogrid-reinforced granular fill over soft clay Geosynth. Int. (IF 4.5) Pub Date : 2023-11-20 M. Fatehi, B. Yaghoobi, M. Payan, I. Hosseinpour, R. Jamshidi Chenari
The current study investigates the ultimate bearing capacity of obliquely/eccentrically loaded shallow strip foundations resting on a geogrid-reinforced granular fill with limited thickness over a very soft to soft clay layer. To this end, the lower bound theorems of the finite element limit analysis (FELA) and second-order cone programming (SOCP) are effectively exploited to simulate the underlying
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Dynamic properties of frozen rubber-reinforced expansive soils under confining pressure Geosynth. Int. (IF 4.5) Pub Date : 2023-11-17 Z. Yang, Z. Cheng, Y. Cui, X. Ling, W. Shi
In recent years, waste rubber has been increasingly utilized to enhance the performance of expansive soil foundations. This study aims to investigate the influence of rubber powder on the dynamic characteristics of frozen rubber-reinforced expansive soils (RRES) in permafrost regions. Temperature-controlled dynamic triaxial tests were conducted on RRES samples, varying rubber content, freezing temperatures
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Study on performance of geocell-reinforced red clay subgrade Geosynth. Int. (IF 4.5) Pub Date : 2023-11-17 X. W. Luo, Z. Lu, J. B. Zhang, H. L. Yao
Three comparative treatment plans are used in red clay subgrade, in order to research the effect of red clay subgrade reinforced with geocell. Multiple subgrade test methods including Benkelman beam, portable falling weight deflectometer, dynamic cone penetrometer and standard vehicle load tests are adopted in the field tests. Test results show that the application of geocell in red clay subgrade can
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Response of sensor-enabled piezoelectric geobelt reinforced soil pullout friction signals Geosynth. Int. (IF 4.5) Pub Date : 2023-11-16 Y. Rao, Z. Liu, G. Ding, J. Wang, H. Wang, X. Wu, Z. Gao
Geosynthetics are widely used in soil reinforcement engineering, where the failure modes of geosynthetics are typically pullout modes. However, current research on monitoring the pullout damage experienced by reinforced soil is limited. Accordingly, this study tested the stress variation laws and signal output characteristics of a sensor-enabled piezoelectric geobelt (SPGB) that can capture the tensile
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Evaluating stability of rigid column-supported and geosynthetic-reinforced embankments Geosynth. Int. (IF 4.5) Pub Date : 2023-11-15 H. Liu, Q. Luo, M. H. El Naggar, K. Liu, T. Wang
Field observations and centrifuge tests indicate that progressive column bending failure accompanies most instabilities of rigid column-supported and geosynthetic-reinforced (RCGR) embankments. However, recognized guidelines specifically for evaluating the overall stability of such systems featuring bending failure remain limited. This study presents a general methodology to calculate the factor of
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Semi-analytical model for axisymmetric transport of contaminant through flawed geomembrane Geosynth. Int. (IF 4.5) Pub Date : 2023-11-15 T. Li, D. Sun, P. Ni, Z. Chen, L. Wang
Geomembrane (GM) is a kind of cost-efficient material for pollutant barrier in landfills, while defects can occur during the installation or service periods, resulting in a mixed-type boundary condition (MTBC) at the top surface of underlying soil layer (SL). In this study, a novel boundary transform method is employed to handle the MTBC problem of axisymmetric transport of organic contaminant through
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Extrapolating residual GMX/GDC interface strength from direct shear tests Geosynth. Int. (IF 4.5) Pub Date : 2023-11-15 J. Lin, T. D. Stark, A. Idries
The residual interface strength is mobilized along sideslopes of geosynthetic lined areas, such as landfill sideslope. Unfortunately, only a large displacement (LD) interface strength is measured in frequently used direct shear tests, which overpredicts the residual interface strength by about 40% because of limited continuous shear displacement and new geomembrane being introduced during the test
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Modular polymer stormwater collection structure response to one-week design-truck load Geosynth. Int. (IF 4.5) Pub Date : 2023-11-14 R. W. I. Brachman, A. Zarpeima, J. M. LeBlanc
Full-scale physical modelling was used to evaluate the response of modular polymer stormwater collection structures when subjected to design-truck loading that was sustained for 1 week (i.e. a parked vehicle) and when buried with minimum soil cover. Surface loading was applied on a steel load pad that simulates one-half of the AASHTO design-truck single-axle that was held constant for 1 week to assess
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Investigation on dynamic performance of soilbag cushion using shaking table tests Geosynth. Int. (IF 4.5) Pub Date : 2023-11-09 B. X. Fang, S. H. Liu, Y. Lu, S. Chen, Y. G. Zhang, C. C. Zhang, C. B. Zhang
Soilbag cushion is one of the promising base isolation methods to reduce seismic energy transfer from ground to building structure. In this study, a series of shaking table tests were conducted comparatively on foundation models with soilbag cushion and sand cushion to evaluate their dynamic performance. The test results indicate that soilbag cushion could significantly reduce acceleration response
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Assessment of the stress crack resistance of multilayered textured HDPE geomembranes Geosynth. Int. (IF 4.5) Pub Date : 2023-10-18 F. B. Abdelaal, M. Zafari, R. K. Rowe
The stress crack resistance (SCR) of different multilayered textured geomembranes (GMBs) immersed in synthetic municipal solid waste leachate at 55°C and 85°C for 50 months was assessed using their smooth edge or smooth equivalent GMBs made from the same formulation as textured GMBs. The difference between the actual thickness of the smooth edge and the nominal thickness of the GMB was shown to result
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Durability of geogrid in a sloped reinforced soil wall after 25 years in service Geosynth. Int. (IF 4.5) Pub Date : 2023-10-18 V. S. Quinteros, R. J. Fannin
The durability of geogrid reinforcement exhumed after 25 years from a sloped wall structure was examined through a comparison of the material properties of exhumed samples with technical data for the original product type. Visual and microscopic inspections found no evidence of installation damage. Analysis of strain increments in rapid loading creep tests to 10 000 h showed excellent agreement between
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Probabilistic analysis for the reinforced fill over void problem Geosynth. Int. (IF 4.5) Pub Date : 2023-10-10 R. J. Bathurst, F. M. Naftchali
Analytical and numerical solutions for the problem of geosynthetic-reinforced fills over a void have been the subject of investigation for the last four decades. A common feature of this prior work is that all methods have treated the analytical solutions as deterministic. While the treatment of some input parameters must be taken as deterministic, there are other parameters that have uncertainty.
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Filtration behaviour of staple fibre geotextiles under unequal biaxial tensile strains Geosynth. Int. (IF 4.5) Pub Date : 2023-10-06 L. Tang, W. Francey, J. Zheng, X. Wang, X. Luo
Gradient ratio tests were conducted to investigate the filtration behaviour of staple fibre needle-punched nonwoven geotextiles subjected to unequal biaxial tensile strains. Three groups of biaxial tensile strains were designed, with the ratios of the strain in the machine direction to that in the cross-machine direction set to 1, 2, and 4, respectively. The strains in the machine direction in the
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Modeling geogrid-stabilized aggregate base courses considering local stiffness enhancement Geosynth. Int. (IF 4.5) Pub Date : 2023-09-28 Y.-H. Byun, I. I. A. Qamhia, M. Kang, E. Tutumluer, M. H. Wayne
Lateral restraint is the primary stabilization mechanism associated with the interlocking of aggregate particles in the geogrid apertures. This paper presents findings from a laboratory study which quantifies the local stiffness enhancement of aggregates through micromechanical interlocking provided by two different types of geogrids. These findings are applied to model the resilient response characteristics
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Antioxidant-stabilizer depletion of 4 HDPE geomembranes with high HP-OIT in MSW leachate Geosynth. Int. (IF 4.5) Pub Date : 2023-09-25 M. Clinton, R. K. Rowe
The antioxidant-stabilizer depletion of four 1.5-mm HDPE geomembranes from the same manufacturer each with a different resin and additive package is examined in air and a synthetic municipal solid waste leachate at a range of temperatures (40–95°C) for 7.5 years. Two were formulated for high temperatures and used polyethylene of raised temperature resistance (PE-RT) resins while two used more conventional
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Permeability mechanism of PVC-P geomembranes based on low-field NMR technology Geosynth. Int. (IF 4.5) Pub Date : 2023-09-25 X. L. Zhang, Y. Y. Wu, C. J. Yin, X. Y. Gu
The permeability of plasticised polyvinyl chloride (PVC-P) geomembranes (GMBs) is of significant importance to the safe operation of impermeable structures and even entire projects. To avoid the drawbacks of the traditional method of adopting the permeability coefficient to characterise permeability, this paper presents a mathematical model of porosity and seepage discharge based on the results of
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Lateral force–displacement relationships for shallowly buried pipe reinforced by geocells Geosynth. Int. (IF 4.5) Pub Date : 2023-09-20 Y. Sawada, M. Kitada, H. I. Ling, T. Kawabata
Geocell reinforcements are proposed as a thrust countermeasure for shallowly buried pipeline bends and tees. The proposed method is easy to construct and has shorter construction time than the use of conventional concrete blocks since it does not require curing. Lateral loading tests were conducted on plates reproducing pipe bends or tees to verify their effectiveness while understanding deformation
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Centrifuge modelling of the progressive failure of geosynthetic-reinforced embankments Geosynth. Int. (IF 4.5) Pub Date : 2023-09-20 G. Zheng, B. Xia, H. Zhou, X. Yu, Y. Diao, Y. Du
Understanding the failure mechanism of geosynthetic-reinforced embankments on soft foundations is crucial for ensuring safety in design. This study aimed to investigate the failure mechanism and stability of embankments reinforced with varying layers and lengths of geosynthetic reinforcements utilising centrifuge testing and numerical modelling. The results show that a foundation under construction
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Investigating the effect of temperature and water freezing on the response of geogrid composite Geosynth. Int. (IF 4.5) Pub Date : 2023-09-20 J. Jarjour, M. A. Meguid
Geosynthetics can be exposed to varying temperature and moisture conditions when embedded in soil, which can affect their mechanical properties. However, existing testing standards do not account for extreme environmental conditions such as low temperatures and ice formation. The aim of this study was to understand the effect of temperature variation and ice formation on the tensile properties of dry
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Thermo-hydraulic numerical modelling of in-soil conditions in reinforced soil walls Geosynth. Int. (IF 4.5) Pub Date : 2023-08-21 A. Moncada, I. P. Damians, S. Olivella, R. J. Bathurst
The role of temperature and relative humidity in long-term mechanical and chemical degradation of polyester fibres due to hydrolysis and creep is well documented. This study presents the results of a thermo-hydraulic 2D finite-element model used to estimate the magnitude and distribution of in situ temperature, relative humidity, and degree of saturation in the backfill of reinforced soil walls (RSWs)
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GMX/GDC strength loss mechanisms Geosynth. Int. (IF 4.5) Pub Date : 2023-08-09 J. Lin, T. D. Stark, A. Idries, S. Choi
This paper provides insight into the causes of post-peak strength loss for textured geomembrane (GMX) and nonwoven geotextile (NGT) interfaces. The NGT can be part of a geosynthetic drainage composite (GDC) or a stand-alone NGT. The study used ring shear tests where one of the two interface materials was replaced after reaching a residual strength condition and the test was restarted to measure the
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Breakthrough time assessment of liner system for MSW landfills with high leachate heads Geosynth. Int. (IF 4.5) Pub Date : 2023-08-07 H. Xie, J. Wu, L. Zhan, A. Bouazza, Y. Shi, Y. Chen, J. Lan
This paper presents a design method for liner systems of municipal solid waste (MSW) landfills with high leachate heads based on the breakthrough time of an indicative contaminant (Chloride). The performance of liner systems with varying thicknesses of compacted clay liner and attenuation layer was assessed. The single composite liner consisting of a geomembrane and a 0.75-thickness compacted clay
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Leakage through a circular geomembrane hole overlain and underlain by silty sand tailings Geosynth. Int. (IF 4.5) Pub Date : 2023-07-27 J. Fan, R. K. Rowe
Experiments are conducted to investigate leakage through circular GMB holes overlain and underlain by both tailings with various hole diameters and GMB thicknesses. Finite element analyses are performed to explore the effect of hydraulic conductivities (k) of subgrade (underliner) and tailings above the GMB (overliner) on water head contours dissipation. An analytical solution is developed for predicting
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Thermo-hydraulic numerical modelling of in-soil conditions in reinforced soil walls Geosynth. Int. (IF 4.5) Pub Date : 2023-07-21 A. Moncada, I. P. Damians, S. Olivella, R. J. Bathurst
The role of temperature and relative humidity on long-term mechanical and chemical degradation of polyester fibres due to hydrolysis and creep is well documented. This study presents the results of a thermo-hydraulic 2D finite-element model used to estimate the magnitude and distribution of in-situ temperature, relative humidity, and degree of saturation in the backfill of reinforced soil walls (RSWs)
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Bearing capacity of footings on geosynthetic-reinforced soils under combined loading Geosynth. Int. (IF 4.5) Pub Date : 2023-07-13 B. Yaghoobi, H. Fathipour, M. Payan, R. Jamshidi Chenari
In this study, the ultimate bearing capacity of shallow strip footings resting on a geosynthetic-reinforced soil mass subjected to inclined and eccentric combined loading is rigorously examined through the well-established method of lower bound limit analysis (LA) in conjunction with finite element (FE) and second-order cone programming (SOCP). Lower bound limit analysis formulation is modified to
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Dynamic stress attenuation characteristics of geocell-reinforced railway subgrade Geosynth. Int. (IF 4.5) Pub Date : 2023-06-23 J. Xiao, K. Wang, L. Xue, Z. Liu, Y. Bai, S. Sun, F. Yang
The dynamic stresses in many subgrades for old railways exceed the bearing capacity of the fillers. The geocell has been used to reinforce weak subgrades and achieve a quick attenuation in the dynamic stress. In this study, a series of field tests were conducted to investigate the dynamic stress attenuation characteristics in a weak subgrade reinforced with a geocell. A coupled finite element-discrete
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Bearing capacity of combined loading footings on geosynthetic-reinforced granular soil Geosynth. Int. (IF 4.5) Pub Date : 2023-06-19 B. Yaghoobi, H. Fathipour, M. Payan, R. J. Chenari
In this study, the ultimate bearing capacity of shallow strip footings resting on a geosynthetic-reinforced soil mass subjected to inclined and eccentric combined loading is rigorously examined through the well-established method of lower bound limit analysis (LA) in conjunction with finite element (FE) and second-order cone programming (SOCP). Lower bound limit analysis formulation is modified to
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Cyclic response of stereoscopic geogrid–sand interface under static and cyclic loading Geosynth. Int. (IF 4.5) Pub Date : 2023-06-13 W. X. Zeng, F. Y. Liu, M. J. Ying
The investigation of cyclic shear response on a geosynthetic–soil interface is important for reinforced soil structures. A stereoscopic geogrid with a thickened transverse-rib thickness increases the interaction with the soil compared with a planar geogrid. In this study, three-dimensional printing technology was used to produce stereoscopic geogrids with transverse-rib thicknesses of 5, 10, 15 and
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New insights into geotribology of non-dilative interfaces from novel experimental studies Geosynth. Int. (IF 4.5) Pub Date : 2023-06-06 L. Kandpal, P. Vangla
The paper presents new insights into the particle kinematics and tribological aspects and their effects on the non-dilative interface shear response from novel experimental investigations. A custom-designed apparatus that enables image analysis of particulate-continuum materials interactions from the bottom of the interface plane while shearing was developed. The effect of influential factors on the
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Geometric and strain behaviour of full-scale geotextile tubes for dewatering sludge Geosynth. Int. (IF 4.5) Pub Date : 2023-05-31 S. T. S. Paranhos, M. A. Aparicio-Ardila, J. Lins da Silva
Geotextile tubes have been presented as a viable alternative for dewatering sludge generated in different industries, characterised by having fine grain and high moisture content. The material commonly used to develop this system is woven geotextile due to its high strength properties. However, nonwoven geotextile tubes are a possible underexplored alternative that have good cost benefits. This paper
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Transport of heavy metal contaminants in a composite liner under non-isothermal condition Geosynth. Int. (IF 4.5) Pub Date : 2023-05-17 W. Jiang, S. Ge, C. Feng, J. Li
A mathematical model for the transport of heavy metal contaminants (HMCs) in a triple-layer composite liner with defective geomembrane under the non-isothermal condition is developed in this study, where the GMB/GCL/CCL (geomembrane, geosynthetic clay liner and compacted clay liner) composite liner is adopted as an example and the Langmuir adsorption model is incorporated. The proposed model is solved
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Chemical durability of bituminous geomembranes (BGMs) in heap leach pad applications Geosynth. Int. (IF 4.5) Pub Date : 2023-05-15 F. B. Abdelaal, A. Samea
The degradation behaviour of a 4.8 mm thick elastomeric bituminous geomembrane (BGM) immersed in pH 0.5, 9.5, and 11.5 synthetic mining solutions is examined over 26 months at 22, 40, 55 and 70°C. The low pH solution simulates the leach solutions found in copper, nickel, and uranium heap leach pads while the two high pH solutions simulate the chemistry and pH found in gold and silver heap leaching
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Strain assessment of polyethylene pipes in dense sand subjected to axial displacement Geosynth. Int. (IF 4.5) Pub Date : 2023-05-11 A. Reza, A. S. Dhar, M. Rahman
Buried polyethylene pipes used in gas distribution systems can experience excessive wall strain when exposed to ground movement that can affect the performance of the pipes in service. This paper presents full-scale laboratory tests performed to investigate the responses of medium-density polyethylene (MDPE) gas-distribution pipes in dense sand when subjected to axial ground movement. Pipes buried
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Reliability analysis of compacted embankment with geocomposite under infiltration Geosynth. Int. (IF 4.5) Pub Date : 2023-04-24 R. Showkat, G. L. Sivakumar Babu
Embankment failures can be prevented by introducing geocomposites to act as drains. The effect of the geocomposite layer on the pore pressure distribution and surface displacements of an unsaturated embankment upon infiltration has been studied numerically using deterministic and probabilistic approaches. The inclusion of the geocomposite layer leads to an increase of suction below the interface and
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Investigation on the long-term strain of geogrid in GRPS embankment under cyclic loading Geosynth. Int. (IF 4.5) Pub Date : 2023-04-24 K.-F. Liu, K.-R. Xue, M.-J. Wen, L. Wang
Geogrid is a horizontal reinforcement material that is used in geosynthetic-reinforced pile-supported (GRPS) embankments in freeways with soft soil. Nevertheless, the long-term deformation mechanics of geogrid in the GRPS embankment under cyclic loading is not clear enough. This paper presents a laboratory model study of a GRPS embankment to study the long-term geogrid strain under cyclic loading.
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Woven geotextile permeability under uniaxial and laterally constrained conditions Geosynth. Int. (IF 4.5) Pub Date : 2023-04-20 K. Y. Li, X. W. Tang, M. L. Fei, W. L. Chen, J. X. Liang, Q. Q. Xiang
Woven slit-film geotextiles are often subjected to in-plane tensile loads in engineering applications, which may alter relevant permeability properties. The fractal model of the permeability coefficient in woven geotextiles is extended to predict the permeability coefficient of geotextiles subjected to uniaxial and laterally constrained uniaxial tensile strains. Based on the observation and summary
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Chemical durability of bituminous geomembranes (BGMs) in heap leach pad applications Geosynth. Int. (IF 4.5) Pub Date : 2023-04-11 F. B. Abdelaal, A. Samea
The degradation behaviour of a 4.8 mm thick elastomeric bituminous geomembrane (BGM) immersed in pH 0.5, 9.5, and 11.5 synthetic mining solutions is examined over 26 months at 22, 40, 55 and 70°C. The low pH solution simulates the leach solutions found in copper, nickel, and uranium heap leach pads while the two high pH solutions simulate the chemistry and pH found in gold and silver heap leaching
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Strain assessment of polyethylene pipes in dense sand subjected to axial displacements Geosynth. Int. (IF 4.5) Pub Date : 2023-04-11 A. Reza, A. S. Dhar, M. Rahman
Buried polyethylene pipes used in gas distribution systems can experience excessive wall strains when exposed to ground movements that can affect the performance of the pipes in service. This paper presents full-scale laboratory tests performed to investigate the responses of medium-density polyethylene (MDPE) gas-distribution pipes in dense sand when subjected to axial ground movements. Pipes buried
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Machine-learning modelling of tensile force in anchored geomembrane liners Geosynth. Int. (IF 4.5) Pub Date : 2023-04-05 K. V. N. S. Raviteja, K. V. B. S. Kavya, R. Senapati, K. R. Reddy
Geomembrane (GM) liners anchored in the trenches of municipal solid waste (MSW) landfills undergo pull-out failure when the applied tensile stresses exceed the ultimate strength of the liner. The present study estimates the tensile strength of GM liner against pull-out failure from anchorage with the help of machine-learning (ML) techniques. Five ML models, namely multilayer perceptron (MLP), extreme
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Gas flow characteristics of GCL under distortions, wet-dry cycles, and hydrating fluids Geosynth. Int. (IF 4.5) Pub Date : 2023-04-04 V. Khan, S. Rajesh
Geosynthetic clay liner (GCL) is commonly used in cover system of engineered landfill to limit migration of gases and infiltration of water. In engineered landfill, gas transfer occurs by advection and diffusion, which may take place at different time frames or simultaneously depending on placement conditions. Hence, efficacy of GCL as a gas barrier under advection and diffusion needs to be assessed
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Laboratory preparation and tensile signal response of sensor-enabled piezoelectric geobelt Geosynth. Int. (IF 4.5) Pub Date : 2023-04-04 Y. Rao, J. Ye, H. Wang, J. Wang, G. Ding, J. Ni
In this study, a sensor-enabled piezoelectric geobelt (SPGB) was developed and its mechanical properties and signal output mode were analysed. It is found that the output voltage signal of SPGB increases with the increase of strain rate. Furthermore, the normalised impedance of SPGB samples at different strain rates has a linear relationship with their strain rate. This study shows that the self-sensing
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Induced trench installation of the high density polyethylene pipe using geofoam inclusion Geosynth. Int. (IF 4.5) Pub Date : 2023-03-17 E. Akınay, H. Kılıç
The effects of induced trench configuration and stiffness of compressible inclusion on the high-density polyethylene (HDPE) pipe behavior were investigated through full-scale laboratory tests. Two pipe-compressible inclusion configurations (‘compressible inclusion over the pipe crown’ and ‘the pipe covered with compressible inclusion’) were tested and expanded polystyrene (EPS) Geofoam with 10 and
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Image-aided physical and compression characterisation of expanded polystyrene geofoam Geosynth. Int. (IF 4.5) Pub Date : 2023-03-16 P. G. Sreekantan, P. Vangla, G. V. Ramana
The present study focuses on an advanced and accurate characterisation of the compressive behaviour of expanded polystyrene (EPS) geofoam with the aid of imaging techniques. To this end, four types of EPS geofoam with nominal densities varying from 15 kg/m3 to 30 kg/m3 are used. Initially, a detailed physical characterisation is carried out including image-based microstructural quantification (cell
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Contribution of geosynthetic to the shear strength of geosynthetic encased stone columns Geosynth. Int. (IF 4.5) Pub Date : 2023-03-07 M. Ji, J. Wang, J.-J. Zheng, Y. Zheng
This paper presents a numerical study to evaluate the contribution of geosynthetic to the shear strength of geosynthetic encased stone column (GESC) under direct shear loading conditions. The backfill soil was characterised using the linearly elastic–plastic Mohr–Coulomb model. The geosynthetic encasement was simulated using linearly elastic liner elements. The interaction between the geosynthetic
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Effect of a soluble subgrade on leakage through a geomembrane defect Geosynth. Int. (IF 4.5) Pub Date : 2023-03-07 J. Fan, R. K. Rowe
Leakage and erosion of a soluble subgrade overlain by a geomembrane with a 70-mm-long slit defect is examined. The subgrade (gypsum) solubility and its rate of dissolution from a solid state in contact with various solutions are investigated. In the absence of flow, the rate of dissolution is negligible. However, when there is flow there is dissolution, and if the flow is high enough, erosion. Erosion
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Particle shape effect on interfacial properties between granular materials and geotextile Geosynth. Int. (IF 4.5) Pub Date : 2023-03-02 C. Kayadelen, G. Altay, Y. Önal, M. Öztürk
This paper presents an experimental study investigating the effect of particle shape of granular soils on the shear strength characteristics via direct shear tests. Thirty direct shear tests were conducted on spherical and crushed sand mixtures with different proportions (i.e. 0%, 25%, 50%, 75% and 100%). The overall regularity (OR) parameter of sand particles varies between 0.788 and 0.909, fairly
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Investigation of rubber content and size on dynamic properties of expansive soil–rubber Geosynth. Int. (IF 4.5) Pub Date : 2023-02-28 Z. N. Yang, Z. C. Lu, W. Shi, C. Wang, X. Z. Ling, J. Li, D. Guan
Waste rubber has been widely applied in geotechnical engineering, benefiting from its light weight, high elasticity, low density, good durability and high compressibility. In this paper, the effects of rubber content (RC) and rubber size (d0) on the dynamic properties of expansive soil–rubber (ESR) were investigated by low-temperature dynamic triaxial tests. The results show that: (1) the shear stress
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Compressive and shear response of fibre-reinforced backfill: impact of field temperature Geosynth. Int. (IF 4.5) Pub Date : 2023-02-28 X. Tian, M. Fall
Fibre-reinforced cemented paste backfill (F-CPB; a mixture of tailings, fibre, cement, and water) is exposed to non-isothermal curing environments in the field. However, no investigations have been conducted on the impact of non-isothermal curing environments on F-CPB compressive strength, shear characteristics and stress–strain behaviour, although these are important design parameters for F-CPB structures
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Numerical simulation of the performance of GRS walls considering freeze-thaw cycles Geosynth. Int. (IF 4.5) Pub Date : 2023-02-22 L.-Q. Ding, F.-L. Cui, C.-Z. Xiao
In practice, little attention has been paid directly to freeze-thaw (FT) cycles during the design and analysis of geogrid-reinforced soil (GRS) walls due to a lack of relevant literature. This study investigates the pavement vertical deformation (s), panel lateral deformation (d), lateral earth pressure (σh), and geogrid strain (ε) of a field GRS wall using an ABAQUS-based numerical model considering
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Determining performance of two-tiered GRS walls subjected to traffic cyclic loading Geosynth. Int. (IF 4.5) Pub Date : 2023-01-16 L. Ding, J. Liu, T. Zhou, C. Xiao, H. Li
This study evaluates the performance of two-tiered geogrid-reinforced soil (GRS) walls subjected to traffic cyclic loading considering several influencing factors. These factors herein include the offset distance (D) of walls, the number (N), amplitude (Pmax), and frequency (f) of applied cyclic loading. Seven GRS walls with a reduced scale of 1 : 3 were prepared in the laboratory and employed to investigate
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Freeze-thaw behavior of geocell-reinforced bases considering different fines contents Geosynth. Int. (IF 4.5) Pub Date : 2023-01-16 M. Huang, C. Lin, S. K. Pokharel
Freeze-thaw (F-T) cycles are a major cause of pavement distress in seasonal frost regions, and the presence of fines in bases can accelerate the pavement degradation induced by cyclic freeze and thaw. Among countermeasures used to mitigate the F-T induced damages in pavements, geocell-reinforced bases can be an effective solution in mitigating F-T damage to cold region roads. However, there is almost
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Performance of landfill low-permeability liners for minimizing groundwater contamination Geosynth. Int. (IF 4.5) Pub Date : 2023-01-09 W. Hu, Y. Yu, R. K. Rowe
Low-permeability liners are required at the base of municipal solid waste (MSW) landfills to minimize leachate leakage and contaminant migration into groundwater. This paper uses a two-dimensional coupled groundwater flow and contaminant transport model to examine the performance of three types of low-permeability liners specified by the current Chinese landfill standard: (1) a compacted clay liner
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Effect of closed and open system freeze–thaw cycles on GMB–GCL interface transmissivity Geosynth. Int. (IF 4.5) Pub Date : 2023-01-05 R. K. Rowe, N. Martinez Noboa, R. W. I. Brachman
An experimental study of the effect of closed system and a limited study of open system freeze–thaw cycles on the interface transmissivity at applied stresses between 10 and 150 kPa is described. The effect of closed system freeze–thaw is most apparent after 100 freeze–thaw cycles and permeation at a stress ≤25 kPa. The effect of permeating fluid chemistry is also evident but decreased with increasing
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Effect of a two-tiered configuration on the seismic behaviour of reinforced soil walls Geosynth. Int. (IF 4.5) Pub Date : 2022-12-16 A. R. Jamnani, M. Yazdandoust, M. Sabermahani
Shaking table tests were performed on reduced-scale models of integrated and two-tiered mechanically stabilised earth (MSE) walls to evaluate the effect of a tiered configuration on the seismic behaviour of metal-strip and geogrid reinforced soil walls. The results showed that, although inextensible reinforcements could reduce the fundamental period, acceleration amplification and lateral deflection
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CFD-DEM modeling of filtration through conventional and conical geotextile filter systems Geosynth. Int. (IF 4.5) Pub Date : 2022-12-13 S. C. Ryoo, S. Erucar, T. M. Evans, A. H. Aydilek
A significant contributor to retaining wall structural failure occurs due to inadequate drainage in the backfill. A numerical model based on a computational fluid dynamics and discrete element method (CFD-DEM) coupled approach was developed to simulate particle movement in the graded filter zone and piping through the geotextiles. The model was used for conventional as well conical geotextile filter
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Geocell-reinforced bed under static and cyclic loads: Soil density and grain size effects Geosynth. Int. (IF 4.5) Pub Date : 2022-12-13 S. N. Moghaddas Tafreshi, S. Kheiri, M. Azizian, A. R. Dawson
This paper reports on a series of static and cyclic plate loading tests performed on a weak unreinforced sand bed in a test pit. The weak sand was covered by a 160 mm thick layer comprised of one of three compacted soil types which was either unreinforced or geocell-reinforced. The purpose was to investigate the effects of soil density and grain size as filler materials for the covering layer. The
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Digital image-based performance evaluation of GCL-sand interfaces under repeated shearing Geosynth. Int. (IF 4.5) Pub Date : 2022-12-01 A. G. Pillai, M. L. Gali
Inadequate shear strength mobilization at the interfaces results in translational failures in Geosynthetic Clay Liners (GCL). Periodic addition of solid waste into the landfill causes additional normal and shear stresses in GCLs. The mechanical response of GCLs and fibre strength are highly time-dependent. Hence the interface shear resistance reduces under the application of repeated shear cycles.
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Three-dimensional analysis of inclined anchors in reinforced sand Geosynth. Int. (IF 4.5) Pub Date : 2022-11-30 S. Mukherjee, A. K. Choudhary, G. L. Sivakumar Babu
Inclined anchors are used in civil engineering structures where the foundations are expected to resist pullout forces during their operational period. This paper presents a three-dimensional numerical analysis of inclined anchors placed in unreinforced and reinforced sand. The influence of several parameters on the response of inclined anchor plates has been investigated in this study. Results indicate