Micro-scale analysis on shear characteristics of unsaturated soil by considering capillary suction and adsorption suction based on DDA

Guo, Lin; Chen, Guangqi; Gao, Jingqing; Li, Changze

doi:10.1016/j.enganabound.2021.08.008

Cited by 5 publications

(2 citation statements)

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“…DDA is an implicit form of DEM. After being widely approved for its preeminent performance in solving macroscopic problems, 35,36 researchers have tried to apply DDA to grain‐scale analysis 37 . By imbedding constitutive law in DDA, the strength of discontinuity surfaces in rock such as rock joints were well computed 38,39 .…”

Section: Instructionmentioning

confidence: 99%

“…After being widely approved for its preeminent performance in solving macroscopic problems, 35,36 researchers have tried to apply DDA to grain-scale analysis. 37 By imbedding constitutive law in DDA, the strength of discontinuity surfaces in rock such as rock joints were well computed. 38,39 Additionally, owing to the unique advantage of the DDA method, it is particularly suited to analyze the water-rock interaction process combined with the discrete fracture network.…”

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confidence: 99%

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Study on the effect of hydro‐chemical dissolution on shear properties of rock fractures using the improved discontinuous deformation analysis

Gao

Chen

Mitani

et al. 2023

Num Anal Meth Geomechanics

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Hydro‐chemical erosion has critical effects on the short‐ and long‐term stability of fractured rock masses in subsurface engineering. Attempts have been made to study this water‐rock interaction process using numerical approaches. However, the majority of the existing approaches quantify the degradation based on the homogeneity hypothesis, which leads to unrealistic results in the case of rock mass with discontinuities. In this study, the hydro‐chemical degradation is represented through geometrical variation of a single crack and reflected in the modified bilinear constitutive model by introducing the hydro‐chemical damage factor. Then, discontinuous deformation analysis (DDA) method embedded in such improvements is chosen to implement the direct shearing process of the rock fracture after hydro‐chemical erosion. The results reveal that the peak shear strength decrease with the increase in the acidity solutions, and a logarithmic relation is found between the decreasing percentage of shear properties and soaking time, which are consistent with the laboratory results. Besides, based on the proposed method, the change in peak shear strength presents synchronism with the variation in the mineral ion and H+${H}^ + $ concentration, shown to be in good agreement with the basic understanding of the dissolution process. In addition, the failure patterns of the sheared samples under different normal stress are studied. This research provides an effective tool to quantify the hydro‐chemical damage from the microscale and will be a significant complement to the coupled numerical analysis of the water‐rock interaction process.

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Section: Instructionmentioning

confidence: 99%

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confidence: 99%