A micromechanics-based enhanced plastic damage model including localization analysis for heterogeneous geomaterials

Shen, Wanqing; Shao, Jian‐Fu; Cao, Yajun; Wang, S.S.; Xu, Weiya

doi:10.1016/j.compgeo.2020.103512

Cited by 10 publications

(3 citation statements)

References 59 publications

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“…For a penetration of area dA of the contactor into a target, the infinitesimal contact force can be given as equation ( 3). e total contact force can be obtained by equation (4).…”

Section: Contact Detection and Interactionmentioning

confidence: 99%

“…ose test techniques are used to obtain the general rock properties, e.g., rock strengths and rock toughness. Besides the experiential method, the numerical techniques have provided a better way to understand the rock fracture mechanics [2][3][4][5][6][7]. Based on the continuous or discontinuous material hypothesis, the numerical techniques include three main types, i.e., continuum-based methods, discontinuum-based methods, and hybrid or combined continuum-discontinuum-based methods.…”

Section: Introductionmentioning

confidence: 99%

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FDEM Modelling of Rock Fracture Process during Three‐Point Bending Test under Quasistatic and Dynamic Loading Conditions

Song

Liu

2021

Shock and Vibration

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A hybrid finite-discrete element method (FDEM) is proposed to model rock fracture initiation and propagation during a three-point bending test under quasistatic and dynamic loading conditions. Three fracture models have been implemented in the FDEM to model the transition from continuum to discontinuum through fracture and fragmentation. The loading rate effect on rock behaviour has been taken into account by the implementation of the relationship between the static and dynamic rock strengths derived from dynamic rock fracture experiments. The Brazilian tensile strength test has been modelled to calibrate the FDEM. The FDEM can well model the stress and fracture propagation and well show the stress distribution along the vertical diameter of the disc during the Brazilian tensile strength test. Then, FDEM is implemented to study the rock fracture process during three-point bending tests under quasistatic and dynamic loading conditions. The FDEM has well modelled the stress and fracture propagation and can obtain reasonable fracture toughness. After that, the effects of the loading rate on the rock strength and rock fracture toughness are discussed, and the mesh size and mesh orientation on the fracture patterns are also discussed. It is concluded that the FDEM can well model the rock fracture process by the implementation of the three fracture models. The FDEM can capture the loading rate effect on rock strength and rock fracture toughness. The FDEM is a valuable tool for studying the rock behaviour on the dynamic loading although the proposed method is sensitive to the mesh size and mesh orientation.

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“…For a penetration of area dA of the contactor into a target, the infinitesimal contact force can be given as equation ( 3). e total contact force can be obtained by equation (4).…”

Section: Contact Detection and Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

FDEM Modelling of Rock Fracture Process during Three‐Point Bending Test under Quasistatic and Dynamic Loading Conditions

Song

Liu

2021

Shock and Vibration

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“…The failure characteristics will become more complex. For example, the localization damage and discontinuous deformation failure are often found in rock engineering [12]. The description of these non-linear behaviors needs to improve the existing models, which result in the difficulty in the theoretical analysis and the complexity of model formulation.…”

Section: Introductionmentioning

confidence: 99%

Phase Field Modeling of Anisotropic Tension Failure of Rock-Like Materials

et al. 2021

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The tensile fracture is a widespread feature in rock excavation engineering, such as spalling around an opened tunnel. The phase field method (PFD) is a non-local theory to effectively simulate the quasi-brittle fracture of materials, especially for the propagation of a tensile crack. This work is dedicated to study the tensile failure characteristics of rock-like materials by the PFD simulation of the Brazilian test of the intact and fissure disk samples. The numerical results indicate that the tensile strength of the disk sample is anisotropic due to the influence of pre-existing cracks. The peak load decreases at first and then increases with the increase of the inclination angle, following the U-shaped trend. The simulation results also indicate that the wing crack growth is the main failure characteristic. Moreover, the crack propagation path initiates at the tip of the pre-existing crack when the inclination angle is less than 60°. Crack propagation initiates near the tip of the pre-existing crack when the angle is 75°, and it initiates at the middle of the pre-existing crack when the angle is 90°. Finally, all cracks extend to the loading position and approximately parallel to the loading direction. This process is in agreement with the Brazilian test of pre-existing cracks in the laboratory, which can validate the effectiveness of the PFD in simulating the tensile fracture of rock-like materials. This study can provide a reference for the fracture mechanism of the surrounding rock in the underground excavation.

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