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  • Mechanisms beneath rectangular shallow foundations on sands: vertical loading
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Yining Teng; Sam A. Stanier; Susan M. Gourvenec

    This paper details analysis of deformation behaviour of silica and carbonate sands under a rectangular foundation subject to uniaxial vertical load based on results from a series of centrifuge model tests. A multiscale particle image velocimetry/digital image correlation (PIV/DIC) technique was used to record and analyse the foundation tests with high resolution and measurement precision. Cone penetrometer

    更新日期:2020-11-17
  • A state-dependent constitutive model for methane hydrate-bearing sediments inside the stability region
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Charles Wang Wai Ng; Sina Baghbanrezvan; Tomas Kadlicek; Chao Zhou

    The presence of methane hydrate in soil pores alters the stress–strain and volumetric behaviour of soil. The extent of this alteration is affected by initial temperature and pore pressure when hydrate is formed inside the thermodynamically stable region. In this paper, a state-dependent critical state model is developed for methane hydrate-bearing sediments (MHBS) within the theoretical framework of

    更新日期:2020-11-17
  • A modified Davis approach for geotechnical stability analysis involving non-associated soil plasticity
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Xi Chen; Dongyong Wang; Yuzhen Yu; Yannan Lyu

    For geotechnical stability analysis involving non-associated plasticity, the Davis approach with internal friction angle and dilatancy angle updated during the strength reduction process can lead to an improvement over the Davis approach without updating the two angles, according to recent studies. However, the Davis approach with internal friction angle and dilatancy angle updated may be overly conservative

    更新日期:2020-11-17
  • Diameter assessment of soilcrete column using in-hole electrical resistivity tomography
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Chun-Hung Lin; Chih-Ping Lin; Yin Jeh Ngui; Haoran Wang; Po-Lin Wu; Guan-Jie He; Hsin-Chang Liu

    Quality control of jet grouting at large depth is a challenging task. An in-hole electrical resistivity method was recently shown to have high potential for assessing the diameter and integrity of jet grouting. To facilitate visualised inspection and practical use of the in-hole resistivity method for jet grouting, this study introduces a novel and practical tomographic approach. An analogous mapping

    更新日期:2020-11-17
  • Adhesion-force micro-scale study of desiccating granular material
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Tomasz Hueckel; Boleslaw Mielniczuk; Moulay Said El Youssoufi

    Experiments on five-, four-, three- and two-wet-hydrophilic-grain clusters were performed to investigate evolution of adhesion of granular media during drying on the micro-scale. The experiments show that the adhesion-force of a cluster initially grows at most to three times the original value before decreasing to zero by the end of evaporation. The adhesion-force is composed of capillary pressure

    更新日期:2020-11-17
  • Statistical charts for determining sample size at various levels of accuracy and confidence in geotechnical site investigation
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Zheng Guan; Yu Wang

    Site investigation is indispensable in geotechnical practice, but only a small portion of the soil affected by the intended geotechnical construction is examined and/or tested in the laboratory or in situ, leading to significant uncertainties in site investigation results. The uncertainty in the site investigation results depends greatly on the number of specimens tested (i.e. sample size) during site

    更新日期:2020-11-17
  • Penetrometer testing in a calcareous silt to explore changes in soil strength
    Géotechnique (IF 3.83) Pub Date : 2020-11-17
    Shiao Huey Chow; Conleth D. O'Loughlin; Zefeng Zhou; David J. White; Mark F. Randolph

    This paper describes a centrifuge study using a range of penetrometer tests (T-bar, piezocone and free-fall piezocone) to explore strength changes in a reconstituted, normally consolidated, natural calcareous silt. Various penetrometer test procedures were applied to measure the penetration resistances including monotonic, cyclic and twitch-type movements as well as pauses for pore pressure dissipation

    更新日期:2020-11-17
  • Ground characterisation for PISA pile testing and analysis
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Lidija Zdravković; Richard J. Jardine; David M. G. Taborda; David Abadias; Harvey J. Burd; Byron W. Byrne; Kenneth G. Gavin; Guy T. Houlsby; David J. P. Igoe; Tingfa Liu; Christopher M. Martin; Ross A. McAdam; Alastair Muir Wood; David M. Potts; Jesper Skov Gretlund; Emil Ushev

    This paper is the first of a set of linked publications on the PISA Joint Industry Research Project, which was concerned with the development of improved design methods for monopile foundations in offshore wind applications. PISA involved large-scale pile tests in overconsolidated glacial till at Cowden, north-east England, and in dense, normally consolidated marine sand at Dunkirk, northern France

    更新日期:2020-10-30
  • New data analysis methods for instrumented medium-scale monopile field tests
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Harvey J. Burd; William J. A. P. Beuckelaers; Byron W. Byrne; Kenneth G. Gavin; Guy T. Houlsby; David J. P. Igoe; Richard J. Jardine; Christopher M. Martin; Ross A. McAdam; Alastair Muir Wood; David M. Potts; Jesper Skov Gretlund; David M. G. Taborda; Lidija Zdravković

    The PISA Joint Industry Research Project was concerned with the development of improved design methods for monopile foundations in offshore wind applications. PISA involved large-scale pile tests in overconsolidated glacial till at Cowden, north-east England, and in dense, normally consolidated marine sand at Dunkirk, northern France. This paper describes the experimental set-up for pile testing, with

    更新日期:2020-10-30
  • Monotonic laterally loaded pile testing in a stiff glacial clay till at Cowden
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Byron W. Byrne; Ross A. McAdam; Harvey J. Burd; William J. A. P. Beuckelaers; Kenneth G. Gavin; Guy T. Houlsby; David J. P. Igoe; Richard J. Jardine; Christopher M. Martin; Alastair Muir Wood; David M. Potts; Jesper Skov Gretlund; David M. G. Taborda; Lidija Zdravković

    This paper describes the results obtained from a field testing campaign on laterally loaded monopiles conducted at Cowden, UK, where the soil consists principally of a heavily overconsolidated glacial till. These tests formed part of the PISA project on the development of improved design methods for monopile foundations for offshore wind turbines. Results obtained for monotonic loading tests on piles

    更新日期:2020-10-30
  • Monotonic laterally loaded pile testing in a dense marine sand at Dunkirk
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Ross A. McAdam; Byron W. Byrne; Guy T. Houlsby; William J. A. P. Beuckelaers; Harvey J. Burd; Kenneth G. Gavin; David J. P. Igoe; Richard J. Jardine; Christopher M. Martin; Alastair Muir Wood; David M. Potts; Jesper Skov Gretlund; David M. G. Taborda; Lidija Zdravković

    The results obtained from a field testing campaign on laterally loaded monopiles, conducted at a dense sand site in Dunkirk, northern France are described. These tests formed part of the PISA project on the development of improved design methods for monopile foundations for offshore wind turbines. Results obtained from monotonic loading tests on piles of three different diameters (0·273 m, 0·762 m

    更新日期:2020-10-30
  • Finite-element modelling of laterally loaded piles in a stiff glacial clay till at Cowden
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Lidija Zdravković; David M. G. Taborda; David M. Potts; David Abadias; Harvey J. Burd; Byron W. Byrne; Kenneth G. Gavin; Guy T. Houlsby; Richard J. Jardine; Christopher M. Martin; Ross A. McAdam; Emil Ushev

    The PISA project was a combined field testing/numerical modelling study with the aim of developing improved design procedures for large-diameter piles subjected to lateral loading. This paper describes the development of a three-dimensional finite-element model for the medium-scale pile tests that were conducted in Cowden till as part of the PISA work. The paper places particular emphasis on the consistent

    更新日期:2020-10-30
  • Finite-element modelling of laterally loaded piles in a dense marine sand at Dunkirk
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    David M. G. Taborda; Lidija Zdravković; David M. Potts; Harvey J. Burd; Byron W. Byrne; Kenneth G. Gavin; Guy T. Houlsby; Richard J. Jardine; Tingfa Liu; Christopher M. Martin; Ross A. McAdam

    The paper presents the development of a three-dimensional finite-element model for pile tests in dense Dunkirk sand, conducted as part of the PISA project. The project was aimed at developing improved design methods for laterally loaded piles, as used in offshore wind turbine foundations. The importance of the consistent and integrated interpretation of the soil data from laboratory and field investigations

    更新日期:2020-10-30
  • PISA design model for monopiles for offshore wind turbines: application to a stiff glacial clay till
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Byron W. Byrne; Guy T. Houlsby; Harvey J. Burd; Kenneth G. Gavin; David J. P. Igoe; Richard J. Jardine; Christopher M. Martin; Ross A. McAdam; David M. Potts; David M. G. Taborda; Lidija Zdravković

    Offshore wind turbines in shallow coastal waters are typically supported on monopile foundations. Although three-dimensional (3D) finite-element methods are available for the design of monopiles in this context, much of the routine design work is currently conducted using simplified one-dimensional (1D) models based on the p–y method. The p–y method was originally developed for the relatively large

    更新日期:2020-10-30
  • PISA design model for monopiles for offshore wind turbines: application to a marine sand
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Harvey J. Burd; David M. G. Taborda; Lidija Zdravković; Christelle N. Abadie; Byron W. Byrne; Guy T. Houlsby; Kenneth G. Gavin; David J. P. Igoe; Richard J. Jardine; Christopher M. Martin; Ross A. McAdam; Antonio M. G. Pedro; David M. Potts

    This paper describes a one-dimensional (1D) computational model for the analysis and design of laterally loaded monopile foundations for offshore wind turbine applications. The model represents the monopile as an embedded beam and specially formulated functions, referred to as soil reaction curves, are employed to represent the various components of soil reaction that are assumed to act on the pile

    更新日期:2020-10-30
  • Application of the PISA design model to monopiles embedded in layered soils
    Géotechnique (IF 3.83) Pub Date : 2020-10-21
    Harvey J. Burd; Christelle N. Abadie; Byron W. Byrne; Guy T. Houlsby; Christopher M. Martin; Ross A. McAdam; Richard J. Jardine; Antonio M. G. Pedro; David M. Potts; David M. G. Taborda; Lidija Zdravković; Miguel Pacheco Andrade

    The PISA design model is a procedure for the analysis of monopile foundations for offshore wind turbine applications. This design model has been previously calibrated for homogeneous soils; this paper extends the modelling approach to the analysis of monopiles installed at sites where the soil profile is layered. The paper describes a computational study on monopiles embedded in layered soil configurations

    更新日期:2020-10-30
  • Unified thixotropic fluid model for soil liquefaction
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Zhihua Wang; Jinlong Ma; Hongmei Gao; Armin W. Stuedlein; Jian He; Binghui Wang

    The geotechnical earthquake engineering profession has struggled with the inherent complexity of the multiphase soil response to cyclic loading owing to the progressive nature of the generation of excess pore pressure (EPP) and degradation of soil stiffness and strength. One approach to improve understanding of the cyclic response and correlate the transition from a two-phase saturated soil to a single

    更新日期:2020-09-14
  • Soil water content–water activity relations of structured kaolinitic specimens from GAB equation
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Sudhakar M. Rao; Monica Rekapalli

    The GAB (Guggenheim–Anderson–de Boer) equation is explored to describe the relation between equilibrium soil water content (wequil) and water activity (relative humidity) of structured kaolinitic soils along the drying path. The equation is chosen as it has the advantage of a theoretical basis and can describe sorption behaviour of soils over a wide range of water activities. The GAB parameters evaluated

    更新日期:2020-09-14
  • Effects of plant growth and spacing on soil hydrological changes: a field study
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Charles Wang Wai Ng; Jun Jun Ni; Anthony Kwan Leung

    Effects of plant growth on soil hydrological changes need to be considered for long-term vegetation management of geotechnical infrastructure. Most existing studies focused on one particular plant age. This study quantifies the effects of plant growth on the evolution of soil hydraulic properties and matric suction over time, through field monitoring and numerical soil–plant–atmosphere interaction

    更新日期:2020-09-14
  • Alternative method to determine the uniaxial-strain compressibility of cohesive sandstone
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Sander Hol; Arjan van der Linden

    Compaction and subsidence risk related to hydrocarbon production are frequently assessed using Geertsma models. The underlying theory assumes linear poroelastic reservoir rock to compress by pore pressure depletion under uniaxial-strain conditions. Adequate mechanical testing techniques have been developed to measure the uniaxial-strain compressibility, although the execution of these methods is technically

    更新日期:2020-09-14
  • Granular flow simulation in a centrifugal acceleration field
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Miguel Angel Cabrera; Alessandro Leonardi; Chong Peng

    The use of the geotechnical centrifuge to obtain scaled physical models is a useful tool in geomechanics. When dealing with granular flows, however, the traditional scaling principles are challenged by the complex rheology of the material and by the non-trivial effects of the Coriolis apparent acceleration. In a laboratory centrifuge, obtaining a clear understanding of these effects is further complicated

    更新日期:2020-09-14
  • Micromechanical investigation of liquefaction of granular media by cyclic 3D DEM tests
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Eduardo L. Martin; Colin Thornton; Stefano Utili

    In order to evaluate numerically the seismic-induced liquefaction potential of gravelly soils, three-dimensional discrete-element method cyclic undrained triaxial tests were performed in a periodic cell. The undrained tests were conducted by deforming the samples under constant volume conditions. The paper presents a detailed investigation into the mechanical phenomena occurring at the grain scale

    更新日期:2020-09-14
  • Monopile rotation under complex cyclic lateral loading in sand
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Iona A. Richards; Byron W. Byrne; Guy T. Houlsby

    Monopiles supporting offshore wind turbines experience combined moment and horizontal loading which is both cyclic and complex – continuously varying in amplitude, direction and frequency. The accumulation of rotation with cyclic loading (ratcheting) is a key concern for monopile designers and has been explored in previous experimental studies, where constant-amplitude cyclic tests have shown rotation

    更新日期:2020-09-14
  • A micro finite-element model for soil behaviour: experimental evaluation for sand under triaxial compression
    Géotechnique (IF 3.83) Pub Date : 2020-09-14
    Sadegh Nadimi; Joana Fonseca; Edward Andò; Gioacchino Viggiani

    This note evaluates the ability of a combined discrete–finite-element approach to replicate the experimental response of a dry sand under triaxial compression. The numerical sample was created by virtualising the fabric of a Martian regolith-like sand sample obtained from an in situ test using X-ray micro computed tomography; physical properties of the grains obtained from laboratory data were used

    更新日期:2020-09-14
  • Mathematical modelling of the mechanical response of earth embankments on piled foundations
    Géotechnique (IF 3.83) Pub Date : 2020-08-17
    Claudio di Prisco; Luca Flessati; Gabriele Frigerio; Andrea Galli

    Piled foundations are largely employed as settlement reducers in the design of artificial embankments on soft soil strata. The commonly employed design methods are, however, based on simplified approaches not allowing the assessment of average and differential settlements at the top of the embankment. With this objective, the authors introduce a generalised constitutive relationship capable of accounting

    更新日期:2020-08-17
  • Behaviour of discrete piles used to stabilise a tree-covered railway embankment
    Géotechnique (IF 3.83) Pub Date : 2020-08-17
    Joel A. Smethurst; Nicola Bicocchi; William Powrie; Anthony S. O'Brien

    Many clay railway embankments in the UK are well over 100 years old, and now suffer from a range of stability and serviceability problems. A common means of remediating earthworks that have either suffered, or are assessed as being at risk of, deep-seated slope failure is to install a row of discrete piles along the mid-slope. This paper presents field data from a 9 m high, pile-stabilised embankment

    更新日期:2020-08-17
  • Relating shaft friction of buried piles and CPT resistance in clayey sands
    Géotechnique (IF 3.83) Pub Date : 2020-08-17
    L. V. Doan; B. M. Lehane

    This paper examines factors controlling the ultimate shaft friction developed on buried piles in normally consolidated clay–sand mixtures and explores the relationship between this friction and the cone penetration test (CPT) end resistance. Results from tension load tests on buried piles in a laboratory pressure chamber and geotechnical centrifuge are presented. Variable rate CPTs combined with Rowe

    更新日期:2020-08-17
  • Analysing the effect of principal stress rotation on railway track settlement by discrete element method
    Géotechnique (IF 3.83) Pub Date : 2020-08-17
    Xuecheng Bian; Wei Li; Yu Qian; Erol Tutumluer

    Principal stress rotation induced by moving loads from trains significantly influences railway track settlement accumulation. The stationary cyclic loading commonly adopted to study railway ballast behaviour under repeated train loading cannot fully represent the effects of principal stress rotation, which needs to be properly considered in both laboratory tests and numerical simulations for a better

    更新日期:2020-08-17
  • Normalised behaviour of a non-plastic silt–pumice sand mixture
    Géotechnique (IF 3.83) Pub Date : 2020-08-17
    Lu Zuo; Beatrice A. Baudet

    The existence and failures of silty sand have been reported worldwide, and the behaviour of sand–silt mixtures at small to large strains has been intensively studied. Owing to the relatively low stress level achieved in laboratory testing, no unifying framework has yet been proposed for sand–silt mixtures. In the presented work, a crushable sand, made of pumice, was used as host sand so as to reach

    更新日期:2020-08-17
  • Full-scale observations of dynamic and static axial responses of offshore piles driven in chalk and tills
    Géotechnique (IF 3.83) Pub Date : 2020-07-14
    Roisin M. Buckley; Richard J. Jardine; Stavroula Kontoe; Pedro Barbosa; Felix C. Schroeder

    This paper describes and interprets tests on piles driven through glacial tills and chalk at a Baltic Sea windfarm, covering an advance trial campaign and later production piling. The trials involved six instrumented 1·37 m dia. steel open-ended tubes driven in water depths up to 42 m. Three piles were tested statically, with dynamic re-strike tests on paired piles, at 12–15 week ages. Instrumented

    更新日期:2020-07-14
  • Evaluation of soil models for improved design of offshore wind turbine foundations in dense sand
    Géotechnique (IF 3.83) Pub Date : 2020-07-14
    Hans Petter Jostad; Birgitte Misund Dahl; Ana Page; Nallathamby Sivasithamparam; Hendrik Sturm

    In order to perform optimised and safe design of foundations for offshore wind turbines (OWT), it is important to have calculation tools that describe the key features of water-saturated soil subjected to complex and irregular loading over a wide range of strain levels. Soils subjected to cyclic loading are prone to strain accumulation. The accumulated (plastic) volumetric strain may result in excess

    更新日期:2020-07-14
  • Effect of torsion on the undrained limiting lateral resistance of piles in clay
    Géotechnique (IF 3.83) Pub Date : 2020-07-14
    Konstantinos Georgiadis; Brian Sheil

    The behaviour of piles subjected to lateral loads has been explored by a number of investigators over the past five decades. However, the vast majority of the previous literature has ignored the potential influence of additional torsional effects due to horizontal eccentricities of the applied lateral loads. In this paper, an upper bound mechanism and a lower bound stress field are presented for the

    更新日期:2020-07-14
  • A macro-element approach to analyse bridge abutments accounting for the dynamic behaviour of the superstructure
    Géotechnique (IF 3.83) Pub Date : 2020-07-14
    Davide Noè Gorini; Luigi Callisto

    This paper describes an original approach to the study of the seismic behaviour of bridge abutments. The proposed method incorporates a simplified description of the dynamic response of the bridge structure into a finite-element model of the soil–abutment system. Specifically, the dynamic behaviour of the bridge structure is described by a macro-element that simulates the loads transferred to the abutment

    更新日期:2020-07-14
  • Consolidation effects on monotonic and cyclic capacity of plate anchors in sand
    Géotechnique (IF 3.83) Pub Date : 2020-07-14
    Shiao Huey Chow; Andrea Diambra; Conleth D. O'Loughlin; Christophe Gaudin; Mark F. Randolph

    This study investigated the change in monotonic and cyclic capacity of a plate anchor across different degrees of consolidation in dense sand. To quantify the effect of consolidation on anchor capacity, a framework is introduced and validated using centrifuge model anchor test data. The centrifuge tests considered a rectangular plate loaded at varying rates in dense sand, under both monotonic and irregular

    更新日期:2020-07-14
  • Improvements in plate anchor capacity due to cyclic and maintained loads combined with consolidation
    Géotechnique (IF 3.83) Pub Date : 2020-07-14
    Zefeng Zhou; Conleth D. O'Loughlin; David J. White; Sam A. Stanier

    Plate anchor technology is an efficient solution for mooring offshore floating facilities for oil and gas or renewable energy projects. When used with a taut mooring, the anchor is typically subjected to a maintained load component and intermittent episodes of cyclic loading throughout the design life. These loads, and the associated shearing, remoulding and consolidation processes, cause changes in

    更新日期:2020-07-14
  • Modelling the long-term hydro-mechanical behaviour of a bentonite pellet/powder mixture with consideration of initial structural heterogeneities
    Géotechnique (IF 3.83) Pub Date : 2020-06-16
    Nadia Mokni; Agustín Molinero Guerra; Yu-Jun Cui; Pierre Delage; Patrick Aimedieu; Michel Bornert; Anh Minh Tang

    The aim of this paper is to investigate the long-term hydro-mechanical behaviour of a highly heterogeneous MX80 bentonite pellet/powder mixture (80/20 in dry mass), which is one of the candidate sealing materials in deep geological repositories. In spite of the operational advantages related to the use of the mixture, structural heterogeneities resulting from the installation process constitute a matter

    更新日期:2020-06-30
  • Soil, basin and soil–building–soil interaction effects on motions of Mexico City during seven earthquakes
    Géotechnique (IF 3.83) Pub Date : 2020-06-16
    Evangelia Garini; Ioannis Anastasopoulos; George Gazetas

    Starting with the destructive 1985 Michoacan Mw 8·0 earthquake, the lake zone of Mexico City has been experiencing ground motions bearing the effects of strong soil amplification at specific site-dependent periods. Last year's Mw = 7·1 Puebla earthquake, although less damaging, with different orientation and mechanism, and at a much shorter distance than the 1985 event, nevertheless produced records

    更新日期:2020-06-30
  • Saturated granular flows: constitutive modelling under steady simple shear conditions
    Géotechnique (IF 3.83) Pub Date : 2020-06-16
    Dalila Vescovi; Pietro Marveggio; Claudio Giulio Di Prisco

    In this paper, the authors analyse numerical and experimental results concerning either dry or saturated granular flows under steady, simple shear conditions. A new constitutive model is introduced, on the base of the mixture theory, according to which granular and liquid phases are considered separately. The constitutive relationship refers to the representative elementary volume and assumes that

    更新日期:2020-06-30
  • Local deformation behaviour of saturated silica sand during undrained cyclic torsional shear tests using image analysis
    Géotechnique (IF 3.83) Pub Date : 2020-06-16
    Chuang Zhao; Junichi Koseki; Weichen Liu

    A series of undrained cyclic torsional shear tests was conducted to investigate the development of local deformations of silica sand specimens directly using an image-based technique and a transparent membrane. The results for saturated sand specimens with varying densities showed that the vertical slippage of sand particles relative to the membrane was initiated at the liquefaction stage. Additionally

    更新日期:2020-06-30
  • A simplified approach to normalisation of piezocone penetration rate effects
    Géotechnique (IF 3.83) Pub Date : 2020-06-16
    Fernando Schnaid; Gracieli Dienstmann; Edgar Odebrecht; Samir Maghous

    The influence of factors controlling the rate of penetration during piezocone tests (CPTU) is addressed in the present paper, including a critical appraisal of measurements adopted as input in existing dimensionless analysis. From a heuristic approach, a method is proposed to identify possible consolidation effects taking place during penetration using the velocity factor, V¯h . Defined as a direct

    更新日期:2020-06-30
  • Field experiments at three sites to investigate the effects of age on steel piles driven in sand
    Géotechnique (IF 3.83) Pub Date : 2020-05-18
    R. Carroll; P. Carotenuto; C. Dano; I. Salama; M. Silva; S. Rimoy; K. Gavin; R. Jardine

    This paper investigates the influences that steel type, in situ soil properties, water table depth, pile diameter, roughness and driving procedures have on the ageing behaviour of piles driven in sand. Tension tests have been performed on 51 open-ended steel micro-piles, with 48 to 60 mm outside diameter, driven at well-established research sites at Larvik in Norway, Dunkirk in France and Blessington

    更新日期:2020-05-18
  • Coupling elasto-plastic behaviour of unsaturated soils with piecewise linear large-strain consolidation
    Géotechnique (IF 3.83) Pub Date : 2020-05-18
    Shunchao Qi; Paul Simms; Farzad Daliri; Sai Vanapalli

    Slurried soils or tailings are often deposited in layers that undergo complex stress paths in terms of desiccation and loading, as a given layer may undergo variable degrees of desiccation before burial by subsequent layers, which has implications for geotechnical stability and geo-environmental performance. Proper analysis therefore requires not only an effective coupling of unsaturated flow with

    更新日期:2020-05-18
  • Evaluation of reverse faulting effects on the mechanical response of tunnel lining using centrifuge tests and numerical analysis
    Géotechnique (IF 3.83) Pub Date : 2020-05-18
    Mohammad Hassan Baziar; Ali Nabizadeh; Nader Khalafian; Chung Jung Lee; Wen Yi Hung

    The present study refers to the effects of reverse faulting in dry sand on the mechanical response of a tunnel lining. Seven centrifuge tests (five tests with tunnel and fault rupture and two tests without tunnel and with fault rupture as free field) were performed in this research and finite-element models are utilised to gain further insight into the interaction between reverse faulting and the tunnel

    更新日期:2020-05-18
  • Field and laboratory study of stress relief due to unloading in block samples of sensitive clay
    Géotechnique (IF 3.83) Pub Date : 2020-05-18
    Helene Alexandra Amundsen; Arnfinn Emdal; Vikas Thakur

    A block sample goes through stress changes during and after sampling. Sensitive clays are affected by sample disturbance and stress changes have a great effect on sample quality. Reduction of the in-situ total stresses to zero causes a soil sample to develop a negative pore pressure. In an ideal situation, a block sample retains its negative pore pressure during sampling and storage, preventing it

    更新日期:2020-05-18
  • A case study of liquefaction: demonstrating the application of an advanced model and understanding the pitfalls of the simplified procedure
    Géotechnique (IF 3.83) Pub Date : 2020-05-18
    Vasiliki (vasia) Tsaparli; Stavroula Kontoe; David M. G. Taborda; David M. Potts

    The complexity of advanced constitutive models often dictates that their capabilities are only demonstrated in the context of model testing under controlled conditions. In the case of earthquake engineering and liquefaction in particular, this restriction is magnified by the difficulties in measuring field behaviour under seismic loading. In this paper, the well-documented case of the Canterbury earthquake

    更新日期:2020-05-18
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