Influence of Normal Stiffness and Shear Rate on the Shear Behaviors and Acoustic Emissions Characteristics of Artificial Rock Joints

Jiang, Yujing; Li, Xinpeng; Wang, Chang-Sheng; Luan, Hengjie; Zhang, Sunhao; Wang, Gang; Wang, Pu

doi:10.3390/app13021189

Cited by 7 publications

(6 citation statements)

References 26 publications

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“…Furthermore, this study reveals a negative correlation between the peak shear strength of jointed specimens and the shear rate, and a positive correlation between it and the confining pressure. This conclusion is consistent with findings made by He et al 52 , Jiang et al 54 , Chen et al 56 , Zhu et al 57 . This can be explained by that the increased shear rate reduces the time for sufficient contact between joint planes, resulting in reduced frictional resistance.…”

Section: Discussion On the Test And Errorssupporting

confidence: 93%

“…He et al 52 conducted constant normal direct shear tests on jointed specimens at different shear rates, and investigated the shear performance with different joint roughness coefficients and joint wall compressive strengths, and under different normal stresses. Meng et al 53 and Jiang et al 54 conducted direct shear tests under various shear rate conditions to investigate the influence of normal stiffness and shear rate on the mechanical properties of the material. The results indicated that with an increase in shear rate, the peak shear stress of the joint decreased nonlinearly, while the peak shear displacement increased.…”

Section: Relative Workmentioning

confidence: 99%

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Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Wang,

Liu,

Jiang

et al. 2024

Sci Rep

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The joints are existing throughout the underground rock mass. It is of great significance to investigate the shear performance of the rock mass to maintain the stability of the underground structure. In this study, we conducted orthogonal tests to determine the proportion of rock-like materials, and used JRC curves to make specimen molds and then prepare the specimens. We conducted straight shear tests and uniaxial compression tests to determine the various mechanical parameters of the rock-like materials. Next, we carried out the compression and shear tests to investigate the shear characteristics of the specimens, and study the damage pattern and shear strength of the jointed rock mass under different confining pressures and roughness levels. The mesoscopic displacements in the shear process of joints were analyzed by using ABAQUS. The test results show that the effect of the confining pressure on the shear strength of the joint plane is relatively obvious, and a larger confining pressure indicates a larger shear strength. The effects of different joint plane roughness and shear rated on the shear characteristics of the joint plane are also significant. The mesoscopic displacement difference inside the joint plane with higher roughness is relatively large, and the stress concentration phenomenon is obvious and lasts longer, which leads to the faster destruction of the specimen with higher roughness and the higher destruction degree. Therefore, we suggest that the priority should be given to the reinforcement of jointed rock mass with high roughness during the construction to prevent sudden destabilization and failure.

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Section: Discussion On the Test And Errorssupporting

confidence: 93%

Section: Relative Workmentioning

confidence: 99%

Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Wang,

Liu,

Jiang

et al. 2024

Sci Rep

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“…Bolt-Grout interfaces were tested in shear using a CNC-type shear test set-up [37,38], which is shown in Figure 5. The apparatus consisted of a loading system, data acquisition and a controlling system.…”

Section: Test Apparatusmentioning

confidence: 99%

Shear Mechanical Properties of Bolt-Grout Interface under Different Bolt Surface Profiles

Zhang,

Liu,

Luan

et al. 2024

Applied Sciences

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The shear behavior of the Bolt-Grout interface has a significant effect on the stability of a bolting system. In this paper, a series of shear tests were conducted on Bolt-Grout interfaces, and the effects of rib spacing, rib angles, and normal stress on the shear characteristics and failure modes of the Bolt-Grout interface were investigated. The results showed that the shear strength varied nonlinearly with an increase in rib spacing and angle, and also that it increased linearly with an increase in normal stress. With smaller rib spacings, the effect of rib spacing on peak shear strength was more apparent. The failure modes of the interface can be categorized as shear-slip failure, shear-break failure, and composite failure. The proportion of shear-slip failure and shear-break failure mainly depends on the rib spacing, rib face angle and normal stress.

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“…Further considering the unstable slip of structural planes, the slip-weakening friction law and the rateand-state friction law are proposed to describe the stick-slip instability (Dieterich, 1979;Rice, 1985). Extensive studies have been carried out to investigate the in uence of shear rate (v s ), σ n , normal stiffness (k n ), roughness, gouge layer and other factors on the shear mechanical properties for shear displacement-driven conditions, and have achieved remarkable research results (Li et al, 2022;Jiang et al, 2023). Furthermore, the shear mechanics under stress-driven conditions is gradually receiving more attentions.…”

Section: Introductionmentioning

confidence: 99%

“…µ is the ratio of τ s to σ n , which is used to represent the friction characteristics of structural planes. Studies have shown that unloading of σ n and loading of τ s contribute to the structural plane instability(Ji et al, 2019;Jiang et al, 2023). For numerical models 1 and 2, during the unloading of σ n , τ s remains constant, and the major principal stress is reduced, causing the initial stress state moves towards the failure envelope.…”

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confidence: 99%

Numerical study on instability of rock structural planes induced by stress disturbances

Hu,

Liu,

et al. 2024

Preprint

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The activities in deep underground engineering may induce variations in the stress state of the rock, increasing the risk of engineering disasters. The decrease in normal stress σn and the increase in shear stress τs are considered as important causes for activation of rock structural planes to induce rockburst, earthquake and other disasters. In this study, numerical simulations are performed to reveal the influences of different stress paths on the dynamic slip mechanism of rock structural planes. The results show that the rock structural plane loaded to the near-critical failure state enters a slow slip state as the stress varies, and the frictional strength decreases with the exponentially increasing shear displacement ds, eventually resulting in dynamic slip. The displacement-driven mode overestimates the friction parameters µ by up to 14.5% compared with the stress-driven mode. The slow slip continuously weakens the ability of the structural plane to tolerate stress variation. The continuity and discontinuity of stress variation on structural plane affect the strengthening mode of µ. The stepwise stress path causes the stress on the structural plane to change dramatically, and may either cause the structural plane return to a slow-slip state or activate the structural plane to dynamic slip. Compared with the variation stress in σn, the variation stress in τs is more sensitive to triggering dynamic slip. The ds before dynamic slip is an important reference for evaluating the extent to tolerate stress variation. With increasing ds from 0.68 mm to 1.26 mm, the τs required to trigger dynamic slip decreases from 1.67 MPa to 1.49 MPa, suggesting that the ability of structural planes to tolerate stress variation is reduced.

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Influence of Normal Stiffness and Shear Rate on the Shear Behaviors and Acoustic Emissions Characteristics of Artificial Rock Joints

Cited by 7 publications

References 26 publications

Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Shear damage mechanisms of jointed rock mass: a macroscopic and mesoscopic study

Shear Mechanical Properties of Bolt-Grout Interface under Different Bolt Surface Profiles

Numerical study on instability of rock structural planes induced by stress disturbances

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