Shear Behavior of Non-Persistent Joint Under High Normal Load

Sarfarazi, Vahab; Haeri, Hadi; Shemirani, Alireza Bagher; Zhu, Zheming

doi:10.1007/s11223-017-9872-6

Cited by 41 publications

(15 citation statements)

References 21 publications

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“…In recent years, many scholars have used the discrete element method to simulate the propagation process of rock cracks, analyze the rock fracture mechanism, and verify the feasibility of this method for simulating rocks by comparing it with the laboratory experiment data [26][27][28][29]. In this section, CDEM was used to simulate a rock mass with prefabricated fractures under uniaxial compression.…”

Section: Feasibility Analysis Of Cdemmentioning

confidence: 99%

Study on the Creep and Fracture Evolution Mechanism of Rock Mass with Weak Interlayers

Zhao

Zhang

Miao

et al. 2022

Advances in Materials Science and Engineering

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To study the influence of weak interlayers on the creep failure characteristics of rock masses, based on the continuous-discontinuous method (CDEM), the uniaxial compression creep experiments of rock masses containing weak layers were numerically simulated; and the weakened rock masses under different conditions were analyzed in detail. We focused on the final failure mode and creep curve of the rock mass with a weak interlayer (θ = 30°, d = 20 mm, c = 1) as examples by selecting the crack distribution state of the model during compression at different time steps. We analyzed the propagation and convergence mode of cracks in a rock mass with weak layers. The research results show that the existence of weak interlayers affects the integrity of the rock mass and the creep failure mode. With the increase in the inclination of the weak interlayer, the failure mode of the rock mass changes from shear failure through the weak layer to slip along the weak layer. For shear failure, the total strain and steady-state creep rate of the rock mass first decrease and then increase, showing a U-shaped distribution; as the thickness of the weak interlayer increases, the rock mass always follows the shear in the weak layer. Creep failure occurs on the fracture surface, and the total strain and steady-state creep rate of the rock mass are positively correlated with the thickness. If the thickness continues to increase, there is no significant difference in the creep characteristics of the rock mass; the volume occupied by the soft rock in the body increases, the overall rigidity of the rock mass decreases, and the plastic deformation increases. The form of creep failure of the rock mass changes from sliding shear failure along the weak layer to sliding shear failure through the weak interlayer. The total strain and steady-state creep rate of the rock mass increase with the increase in the number of weak layers; the greater the distance between the weak layers, the smaller the total strain and steady-state creep rate of the rock mass. The slower the crack growth rate, the less likely the rock mass to undergo creep damage.

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Section: Feasibility Analysis Of Cdemmentioning

confidence: 99%

Study on the Creep and Fracture Evolution Mechanism of Rock Mass with Weak Interlayers

Zhao

Zhang

Miao

et al. 2022

Advances in Materials Science and Engineering

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“…The excavation stability in shaft sinking or tunnel and drifting engineering and bore-hole stability of oil and gas engineering are closely related to cavity-contained rock. Previously, a lot of attempts have been made to reveal the mechanical responses of cavity-contained rock by numerical test, 11,12 uniaxial or triaxal compression test, [13][14][15][16] multi-axis hollow column test, 17 Brazilian disk test, 18 uniaxial dynamic impacting test, [19][20][21] triaxial repetitive impact test, 22 and hydraulic fracturing test. 23 The strength, crack damage behavior, damage evolution, energy dissipation, hole spalling pattern, and failure modes were systemically investigated for hollow rock exposed to static to dynamic loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission and computed tomography investigation on fatigue failure of fissure‐contained hollow‐cylinder granite: Cavity diameter effect

Wang¹,

Yi²,

Han

et al. 2022

Fatigue Fract Eng Mat Struct

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This work aims to investigate the influence of cavity diameter on fracture behaviors for fissure-contained hollow-cylinder granite subjected to multistage cyclic loads, using acoustic emission detection, and post-test computed tomography (CT) scanning. The influence of the cavity diameter on rock fracture was revealed in terms of volumetric deformation, stiffness degradation, AE output activities, hole spalling, and crack coalescence pattern.The testing results show the both the volumetric strain and AE b value decrease with increasing cavity diameter. An increase of volumetric strain and a decrease of AE b value are found during rock failure and their relationship was established. In addition, damage is quantificationally characterized by the released energy, and a damage evolution model is defined to characterize rock damage process. Moreover, post-test CT visualization highlights the communication between the hole and fissures at the rock bridge segment, and it is suggested that failure severity decreases with the increase of hole diameter.

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“…Haeri [28] studied the mechanism of crack propagation in concrete specimens containing cracks under shear loading conditions, and he found that the precracked concrete failure occurs in the mixed mode in the case of nonoverlapping cracks configuration and in the tensile mode for the overlapping cracks. Haeri [29][30][31][32] used a modified higher-order semi-infinite displacement discontinuity method (HSDDM) with thirdorder displacement discontinuity elements (cubic elements) to estimate the stress intensity factor in the fractured rocks underneath a single disc cutter. Yang et al [33,34] utilized DIC (digital image correlation) technology to monitor and analyze the failure process of specimens and investigated the relationship between the strength of the fractured rock and the crack propagation process.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Crack Initiation and Propagation of Unequal Cracks in Rock-Like Materials

Chen

Huang

Duan

2022

Advances in Materials Science and Engineering

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The crack in the rock is a system that coexists with multiscale and interaction cracks, and it is necessary to evaluate the deformation, stability, and strength of rock mass in many engineering projects and the failure of rock are related to the distribution of cracks in the rock. Cracks of different lengths were set in rock-like materials, and uniaxial loading experiments were carried out under 30 test conditions by changing the length of the rock bridge and the short crack as well as the crack angle. During the experiment, a high-speed camera system was used to record the failure process of the specimens. The following conclusions were obtained: when the crack angle is in the range of 30°to 60° with the loading direction, the shorter cracks are more likely to propagate and coalesce. Most of the specimens initiate cracking from the outer tip of the longer crack and the key point of crack instability is the outer tip of the longer crack. The coalescence mode of the cracks is mainly related to the length of the rock bridge length and the crack angle.

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Shear Behavior of Non-Persistent Joint Under High Normal Load

Cited by 41 publications

References 21 publications

Study on the Creep and Fracture Evolution Mechanism of Rock Mass with Weak Interlayers

Study on the Creep and Fracture Evolution Mechanism of Rock Mass with Weak Interlayers

Acoustic emission and computed tomography investigation on fatigue failure of fissure‐contained hollow‐cylinder granite: Cavity diameter effect

Experimental Study on the Crack Initiation and Propagation of Unequal Cracks in Rock-Like Materials

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