Numerical Simulations on Cracking Behavior of Rock-Like Specimens with Single Flaws under Conditions of Uniaxial and Biaxial Compressions

Zhao, Cheng; Niu, Jialun; Zhang, Qingzhao; Shao, Yu; Morita, Chihiro

doi:10.1061/(asce)mt.1943-5533.0002967

Cited by 18 publications

(2 citation statements)

References 25 publications

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“…Rodríguez et al (2016) carried out loading-unloading splitting tests on marble disks containing micro-fissures, studied the development and evolution process of micro-cracks, and found that the cracking process is brittle, explosive, and localized. By studying the crack propagation and condensation behavior in rock materials, Lin et al (2019), Zhao C. et al (2019, and Cheng et al (2016) found that the crack opening has a significant impact on the crack initiation stress and path. Yang et al (2017); Li et al (2005), and Bobet (2009, 2010) conducted systematic experimental studies on prefabricated fractures of rock model materials and found that new cracks develop and expand steadily along the crack end and incline toward the direction of maximum compressive stress.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Deformation and Energy Change of Single-Joint Sandstone After Freeze-Thaw Cycles and Cyclic Loadings

et al. 2019

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In cold regions, saturated fractured rock is prone to crack initiation, extension, and branching along the original fracture end under the effect of freeze-thaw (F-T) cycles and cyclic fatigue loadings. The resulting strength deterioration is accompanied by large amounts of pore growth, which results in localized damage and fracturing along the crack end and even causes overall failure. To study the fatigue damage behaviors of fractured rocks under F-T cycles and cyclic loadings, single-joint quasi-sandstone specimens with joint angles of 45 • and 90 • were prepared. Subsequently, F-T damage tests with 0, 10, and 20 cycles and cyclic loading tests with different stress levels were performed. The F-T damage features are discussed based on the binarization image of localized damage along the joint ends and their wave velocity variations. It is found that the frost damage of single-joint quasi-sandstone tends toward a strip with localized fatigue characteristics. Moreover, the changes of strain compliance and dissipated energy are studied under the effect of loading-unloading fatigue. Some of the interesting phenomena observed are as follows: (i) during the early stage of cyclic loading, the joint can be compacted; nevertheless, it tends to expand along the fracture direction once it passes the elastic stage, and the irreversible plastic deformation is stable at this stage. (ii) The cracks caused by F-T damage in the 45 • single-joint samples deflect along the fracture direction, in contrast to the 90 • single-joint specimens. Moreover, the samples with a 45 • single joint are more susceptible to original fracture at the early stage of the failure process, which results in a different failure mode from that of the 90 • single-joint samples. (iii) The F-T cycles and cyclic loadings have a coupling effect on the single-joint sandstone. The strain compliance and hysteresis energy keep increasing uniformly after the F-T cycles and cyclic loadings.

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Section: Introductionmentioning

confidence: 99%

Fatigue Deformation and Energy Change of Single-Joint Sandstone After Freeze-Thaw Cycles and Cyclic Loadings

et al. 2019

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“…These two effects result in joints with different undulations and different mechanical properties occur inside the rock mass. Joint is the key part of stress concentration and release, and its mechanical characteristics control the deformation and strength of rock mass (Aziznejad et al., 2018; Xie et al., 2020; Yang et al., 2019; Yong et al., 2018; Zhao et al., 2019), the instability and failure of slopes, tunnels and storage chambers often starts from the deterioration of the joint (Monsen and Barton, 2001; Rasouli Maleki, 2018; Shen et al., 2019, 2020; Zhao et al., 2020). The morphology and mechanical properties of joints are important factors affecting the stability evaluation of rock mass engineering.…”

Section: Introductionmentioning

confidence: 99%

Damage evolution characteristics of saw-tooth joint under shear creep condition

Zhang

Lin

Wang

et al. 2020

International Journal of Damage Mechanics

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The creep characteristics of joint have an important influence on the long-term stability of rock mass engineering such as tunnels and slopes. In this paper, the sawtooth angle α is taken as the variable, five different numerical models of regular sawtooth joints are established using the discrete element numerical method, to study the shear mechanical characteristics of joints under creep condition. In addition, the shear mechanical properties of joints under transient condition are compared to analysis the influence of creep on the mechanical characteristics of joint. The results show that under shear creep condition: (1) Shear displacement of joint increases stepwise with time. At low sawtooth angles, the difference of joint shear displacement with different normal stresses is large. The long-term shear strength of joint is proportional to normal stress and sawtooth angle. (2) The total absorbed energy U and elastic energy Ue of the joint both increase as the sawtooth angle α increases. Dissipated energy Ud tends to increase first and then decrease with increasing sawtooth angle. Compared with the energy characteristics under transient condition, it is found that the joint under creep condition not only has a lower shear strength, but also requires less total absorbed energy and dissipative energy, and fewer cracks at critical failure. (3) Before the peak strength, the damage variable D increases nonlinearly with the shear displacement. Compared with the transient condition, the damage amount corresponding to the peak strength under the creep condition is smaller, and the evolution rate of the damage variable D with shear displacement at the critical failure is higher.

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Testing and Numerical Simulations on Fracture Behavior of Fresh Quartzite Rock Using the Discrete Element Method

Ramana

Verma

Prakash

2022

Recent Advances in Applied Mechanics

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Numerical Simulations on Cracking Behavior of Rock-Like Specimens with Single Flaws under Conditions of Uniaxial and Biaxial Compressions

Cited by 18 publications

References 25 publications

Fatigue Deformation and Energy Change of Single-Joint Sandstone After Freeze-Thaw Cycles and Cyclic Loadings

Fatigue Deformation and Energy Change of Single-Joint Sandstone After Freeze-Thaw Cycles and Cyclic Loadings

Damage evolution characteristics of saw-tooth joint under shear creep condition

Testing and Numerical Simulations on Fracture Behavior of Fresh Quartzite Rock Using the Discrete Element Method

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