Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation

Wang, Yong; Wang, Yanli; Kong, Lingwei; Sun, Zhiying

doi:10.1016/j.jrmge.2020.01.007

Cited by 15 publications

(5 citation statements)

References 30 publications

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“…However, the previous investigations demonstrated that shear dilative behavior also takes place in saturated loess in triaxial tests (Zhang et al, 2017;Zhang et al, 2019). Consequently, we compare the difference in the steady-state line constructed by triaxial shear test data (Yang et al, 2004;Zhou et al, 2010;Jiang et al, 2014), as a dark red line shown in Fig. 12.…”

Section: Steady-state Linementioning

confidence: 90%

Initiation and mobility of irrigation-induced loess flowslide recurrence on the Heifangtai area in China: Insights from hydrogeological conditions and liquefaction criteria

Zhang¹,

Wang²,

Peng³

2021

Preprint

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The Heifangtai area is commonly known as the museum of loess landslides in China. Irrigation-induced loess flowslides frequently recur along the margin cliffs of the Hefaingtai terrace, causing 42 fatalities and significant economic losses, as well as major ecological and environmental problems, such as increased soil erosion rate. The initiation and mobility of these irrigationinduced loess flowslide recurrences remain undetermined. On three typical recurrences of the loess flowslides, we performed joint geophysical detection using electrical resistivity tomography (ERT) and multichannel analysis of surface waves (MASW), and also tested loess basic properties by field profile sampling. In addition, we examined the shear behaviors of saturated loess utilizing an undrained ring shear apparatus. The geophysical signatures and in-situ loess property profiles showed that hydrogeological conditions are key to the initiation of recurring loess flowslides. The results also demonstrated that liquefaction shear behaviors of saturated loess control the mobility of after-failure of the loess flowslides. Rapid criteria of liquefaction susceptibility evaluation are suggested to provide a better understanding of the dynamic mechanisms of loess flowslides. These findings shed substantial light on long-runout flowslides that occur in fine-grain soil and their implications for landslide hazard mitigation.

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Section: Steady-state Linementioning

confidence: 90%

Initiation and mobility of irrigation-induced loess flowslide recurrence on the Heifangtai area in China: Insights from hydrogeological conditions and liquefaction criteria

Zhang¹,

Wang²,

Peng³

2021

Preprint

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“…This structure is also easy to generate higher possibility of pressure concentration and force-chain buckling between particles. This failure evolution has been applied in triaxial compression and direct shear tests (Wand et al 2011;Wang et al 2020). The bond breakages thus have two impacts: (a) creating the weak position and (b) changing the associated force chains from a reticular trait into a columnar structure.…”

Section: Failure Evolution Process and Patternmentioning

confidence: 99%

Experimental investigation and discrete element method simulation on mechanical properties and failure mechanism of polymer-stabilized sand

Che

Jin

et al. 2021

Bull Eng Geol Environ

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Natural sand can be heavily eroded due to its weak internal cohesion, and most solutions are reinforced by recovering particle connections regardless of their environmental impact. In view of this, our study focuses on an organic polymer reinforcement (PU) and investigates the strength, failure behavior, and energy evolution. Unconfined compressive tests are conducted, and the DEM method is used to establish corresponding numerical models, which contains the various polymer contents and densities. The results indicate that the compressive strengths are strongly improved with increasing polymer content and specimen density. The polymer has significant impacts on mechanical strength, failure behavior, and energy evolution. The failure pattern of the specimens with various polymer contents is changed from single to multiple path cracks. The specimens of various densities, however, only have difference in path extension. The failure process of the polymer-stabilized sand distinctly depends on the bond breakage state. Its increment curves can be divided into compaction phase, slow expansion phase, fast propagation phase, and stability phase. The instability microstructure of force chains is transformed by polymer effects, which causes force-chain reconstruction, micro-cracks redistribution, and energy increment. The level of energy averages and releasing rates are both improved with the polymer content. The insights from the physical and numerical tests are expected to help understand the possible reinforcement mechanisms of polymer and the potential relations between cracks development and energy evolution.

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“…Huang et al [6] concluded that the decline in interparticle contacts indicated damage to the sand fabric and decreased the liquefaction resistance using DEM. Wang et al [7] quantitatively estimated the sand structure and attempted to study the features of the axial strain in the post-liquefaction stage. Zhang et al [8] proposed a fabric evaluation method based on the interparticle contact normal to observe the overall evolution of sand structure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of large axial strain of granular sand in post-liquefaction stage using DEM simulation

Ma,

Ni,

Zhang

2024

IOP Conf. Ser.: Earth Environ. Sci.

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Field investigations in recent studies have revealed that significant damage to foundations often occurs in the post-liquefaction stage, during which sand undergoes substantial deformation. As a result, numerous researchers have dedicated considerable effort to studying the evolution of the axial strain at this stage. However, the accurate measurement of the exact value of this strain is challenging mainly owing to the limitations of the triaxial apparatus. In this study, the numerical method of discrete element method (DEM) is used to simulate undrained cyclic triaxial loading tests according to a large number of loading cycles. The mechanical behaviour of granular sand under different cell pressures was reproduced using the DEM method, wherein the liquefaction resistance increased with the cell pressure. The post-liquefaction axial strain exhibited a similar pattern of variation among the calculated cases at different cell pressures. The value of the double amplitude of the axial strain stabilised at a maximum value after a certain loading cycle. The microscopic characteristics derived from the DEM calculations, including the contact number and force chain network, were analysed to provide reasonable explanations. The sand fabric was re-established after a large number of loading cycles and controlled by cyclic loading, which helped stabilise the accumulated axial strain.

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Post-liquefaction shearing behaviour of saturated gravelly soils: Experimental study and discrete element simulation

Cited by 15 publications

References 30 publications

Initiation and mobility of irrigation-induced loess flowslide recurrence on the Heifangtai area in China: Insights from hydrogeological conditions and liquefaction criteria

Initiation and mobility of irrigation-induced loess flowslide recurrence on the Heifangtai area in China: Insights from hydrogeological conditions and liquefaction criteria

Experimental investigation and discrete element method simulation on mechanical properties and failure mechanism of polymer-stabilized sand

Evaluation of large axial strain of granular sand in post-liquefaction stage using DEM simulation

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