Study on the deformation and strength characteristics of hard rock under true triaxial stress state using bonded-particle model

Zhang, Shihuai; Wu, Shunchuan; Kang, Di

doi:10.1016/j.compgeo.2019.04.005

Cited by 31 publications

(7 citation statements)

References 66 publications

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“…Yet, Burger's contact model cannot mimic the grain's cementation process, which is weak in simulating the rock mechanical behavior. By contrast, the Parallel Bonded model (PBM) [30] is widely used in DEM, which can cement the grains to be a rock-like material. Herein, we can add Burger's model to a PBM-dominated model to mimic the full creep behavior of soft rock.…”

Section: Methodsmentioning

confidence: 99%

Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock

Xia

Liu

Zhou

2021

JMSE

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Pervasive, unavoidable and uncontrollable creep failure generated in soft-rock engineering occasionally happens and therefore attracts extensive attention recently. However, due to soft rock’s multi-factor creep mechanism, it is still difficult to simulate the full-stage creep with the Distinct Element Method (DEM). In this study, we proposed an improved simulation method based on the classical Burger’s model and the Parallel Bonded model in Particle Flow Code (PFC). We apply the abovementioned models together to simulate the full-stage creep process in soft rock. The proposed process has considered the mesoscopic mechanical characteristics of DEM carefully and finally resulted in a parallel physical model, which is called Burger’s Bonded model in this paper. The DEM simulation test using Burger’s Bonded model was designed to compare with experiments. The experiments include a normal creep test and a uniaxial loading test with prefabricated cracks. In contrast to experimental results, the numerical results show that the average error during the whole creep process is less than 3%; the stress–strain curves and crack development process show great agreement. It is also found that the wing crack coalescence in soft rock is independent of the prefabricated crack angle, propagating with a fixed dip angle. The results show that the numerical method proposed in this paper can simulate the multi-factor-caused full stage (attenuated, steady, accelerated) creep process of soft rock in DEM, which provides new insights for theoretical research and engineering design.

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Section: Methodsmentioning

confidence: 99%

Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock

Xia

Liu

Zhou

2021

JMSE

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“…Park [ 22 ] introduced a rock structural plane based on the BPM model and conducted a large number of rock direct shear tests. To study the deformation and strength characteristics of granite under true triaxial loading, Zhang [ 23 ] performed 3D PFC numerical simulations using BPM. Zhang [ 24 ] discussed the acoustic emission characteristics of rocks under different compression loading rates based on BPM.…”

Section: Numerical Modelmentioning

confidence: 99%

Study on Meso-Material Parameters of Submarine Weathered Granite Based on Parallel Bond Model

Zhang¹,

Zhang

Han

et al. 2022

Materials

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In order to study the mechanical properties of submarine weathered granite under marine geological conditions, uniaxial compression tests were carried out on the original medium weathered granite of the seafloor of an offshore area in Pingtan, Fujian Province by using triaxial experimental apparatus to analyze the fracture characteristics, stress–strain characteristics, and compressive strength indexes. Based on the theory of discontinuous medium, the uniaxial compression and uniaxial tensile tests of rocks were simulated, and the microscopic mechanical parameters of discrete elements of granite samples were determined based on the indoor macroscopic mechanical tests: effective modulus Et, compressive elastic modulus Ec, macro Poisson’s ratio μ, and uniaxial compressive strength σc. The results show that the parallel bond model has good simulation results for the uniaxial compression test, but the tensile strength and tensile–compression ratio were quite different from the experimental values. When the confining pressure is large, the calibrated parameter adaptability by uniaxial compression is poor. The reason for certain errors is a large resistance of the parallel bond model to particle rotation and the influence of normal stress on shear strength is not considered. The cementation model can be modified by adding coefficients based on laboratory test results.

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“…The macroscopic behaviors of BPM are associated with the micro-parameters characterizing the parallel bonds and particles, 42 which cannot be obtained directly from laboratory experiments. Therefore, these microparameters have to be calibrated by comparing the macroscopic behaviors of BPM with those of a physical rock sample.…”

Section: Model Generation and Microparameter Calibrationmentioning

confidence: 99%

Deformation and failure characteristics of sandstone subjected to true‐triaxial unloading: An experimental and numerical study

Fan

Jiang

et al. 2021

Fatigue Fract Eng Mat Struct

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In this research, we conducted both laboratory experiments and discrete element simulations to investigate the influence of maximum principal stress level on true‐triaxial unloading behaviors of sandstone samples. The results show that as the level of σ1 at the unloading point increases, the ultimate bearing capacity of sandstone sample is increasingly strengthened, while the sample collapses more easily during the unloading process, and the failure mode of sample changes from mixed tensile‐shear failure to shear failure. With the increase in the level of σ1, the accumulative micro‐cracks at the unloading point and micro‐crack generation rate during the unloading phase exhibit increasing trends, while the ratio between the number of tensile micro‐cracks and shear micro‐cracks generally shows a downward trend. The formation of macro fracture in sandstone sample is closely related to the material inhomogeneity and true‐triaxial stress state.

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Study on the deformation and strength characteristics of hard rock under true triaxial stress state using bonded-particle model

Cited by 31 publications

References 66 publications

Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock

Burger’s Bonded Model for Distinct Element Simulation of the Multi-Factor Full Creep Process of Soft Rock

Study on Meso-Material Parameters of Submarine Weathered Granite Based on Parallel Bond Model

Deformation and failure characteristics of sandstone subjected to true‐triaxial unloading: An experimental and numerical study

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