Large post-liquefaction deformation of sand, part I: physical mechanism, constitutive description and numerical algorithm

Zhang, Jianmin; Wang, Gang

doi:10.1007/s11440-011-0150-7

Cited by 138 publications

(50 citation statements)

References 104 publications

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“…1b). The amplitude of this strain is termed by Zhang and Wang [41] as the post-liquefaction shear strain at zero effective stress, denoted by c 0 . Figure 1c depicts the evolution of shear strain during the 11th load cycle of an undrained cyclic torsional test on Toyoura sand at a relative density D r of 70 % [40], where significant deformation occurs at the liquefaction state once during the first half load cycle in the positive loading direction and once during the second half cycle (denoted as cycle 11.5) in the negative direction.…”

Section: Introductionmentioning

confidence: 99%

“…Significant effort toward this end has been made in several constitutive studies through various assumptions associating c 0 with dilatancy and fabric history (e.g., [4,10,36,41]). However, as laboratory tests generally only provide macroscopic measurements of stress, strain, void ratio, pore pressure, etc., little progress has been made toward revealing the intrinsic microstructural and sand fabric evolution processes causing the accumulation and eventual saturation of c 0 at liquefaction.…”

Section: Introductionmentioning

confidence: 99%

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DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

et al. 2016

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In an effort to study undrained post-liquefaction shear deformation of sand, the discrete element method (DEM) is adopted to conduct undrained cyclic biaxial compression simulations on granular assemblies consisting of 2D circular particles. The simulations are able to successfully reproduce the generation and eventual saturation of shear strain through the series of liquefaction states that the material experiences during cyclic loading after the initial liquefaction. DEM simulations with different deviatoric stress amplitudes and initial mean effective stresses on samples with different void ratios and loading histories are carried out to investigate the relationship between various mechanics-or fabric-related variables and postliquefaction shear strain development. It is found that wellknown metrics such as deviatoric stress amplitude, initial mean effective stress, void ratio, contact normal fabric anisotropy intensity, and coordination number, are not adequately correlated to the observed shear strain development and, therefore, could not possibly be used for its prediction. A new fabric entity, namely the Mean Neighboring Particle Distance (MNPD), is introduced to reflect the space arrangement of particles. It is found that the MNPD has an extremely strong and definitive relationship with the post-liquefaction shear strain development, showing MNPD's potential role as a parameter governing post-liquefaction behavior of sand.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

et al. 2016

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“…The complicated mechanical behaviour of liquefiable sands should be finely and reasonably described in good numerical simulations. Based on many results of undrain triaxial tests and torsion shear tests, Jian-min Zhang, Gang Wang [10][11][12] formulated a plasticity model for large post-liquefaction shear deformation of sand considering physical mechanisms. Rui Wang et al [13,14] developed a unified plasticity model for large post-liquefaction shear deformation of sand, which was able to achieve unified description of the behaviour of sand at different states under monotonic and cyclic loading during both pre-and post-liquefaction regimes.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response and load distribution of pile groups in layered liquefiable ground

Xing

Wang

Zhang

2016

JGS Special Publication

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Three dimensional finite element simulation of 3×5 pile groups in layered liquefiable ground during earthquake was carried out in this paper to investigate the dynamic load distribution within the pile groups. A unified plasticity model for large post-liquefaction shear deformation of sand was used for the appropriate simulation of soil liquefaction. Load distribution over the corner, edge and central piles was studied. The influence of pile spacing on the load distribution was also studied. Numerical results showed the corner piles, the edge piles and the central piles were subjected to varying dynamic loads. The pile spacing had significant impacts on the load distribution of pile groups.

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“…According to previous studies on the soil-structure interaction (SSI), structural dynamic responses are reported to be influenced in a soft soil rather than the stiff case [3,10,42]. In the pioneering study, Luco and Contesse [21] designated the SSSI on seismic responses of neighboring buildings.…”

Section: Introductionmentioning

confidence: 99%

Seismic interaction of underground RC ducts and neighboring bridge piers in liquefiable soil foundation

2015

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A coupled system of an underground reinforced concrete (RC) duct and a neighboring bridge pier supported by group piles is numerically investigated in sandy soil at both drained and undrained liquefiable states under seismic ground excitations. Parametric studies are conducted to evaluate influencing factors on seismic performances of these neighboring interactive structural systems. The numerical simulations are performed with the finite element code COM3 (COncrete Model for 3D) (Maekawa, Pimanmas and Okamura in Nonlinear mechanics of reinforced concrete, 2003), which is capable of simulation of inelastic performance of RC structure and high nonlinearity of soil medium, especially on the liquefiable loose sand. It is mechanically pointed out that liquefaction-induced uplift of underground ducts is substantially influenced by the presence of on-ground bridges. Alternatively, inertial forces induced to the onground bridge pier are also noticeably affected by the presence of the neighboring underground RC duct. It is pointed in practice of design that these nonlinear interacting responses between these neighboring infrastructures are greatly magnified on liquefiable soil foundations.

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Large post-liquefaction deformation of sand, part I: physical mechanism, constitutive description and numerical algorithm

Cited by 138 publications

References 104 publications

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

DEM study of fabric features governing undrained post-liquefaction shear deformation of sand

Dynamic response and load distribution of pile groups in layered liquefiable ground

Seismic interaction of underground RC ducts and neighboring bridge piers in liquefiable soil foundation

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