Estimating the support effect of energy-absorbing rock bolts based on the mechanical work transfer ability

Wu, Xuezhen; Jiang, Yujing; Guan, Zhongguo; Wang, Gang

doi:10.1016/j.ijrmms.2018.01.041

Cited by 61 publications

(21 citation statements)

References 25 publications

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“…The lateral stress of coal bodies (equivalent to the confining pressure) is gradually reduced during mining, and the advanced bearing pressure (equivalent to the axial stress) gradually increases. Working face mining involves a reduction of 2018; Kong et al, 2016;Biancolini et al, 2009), spectral (Traore et al, 2017;Wu et al, 2018;Gong et al, 2017), and waveform characteristics (Feng et al, 2017;Wang et al, 2018) of AE signals and obtained many useful conclusions.…”

Section: Methodsmentioning

confidence: 99%

Acoustic emission characteristics of coal under different triaxial unloading conditions

Yang¹

2020

Acta Geodynamica Et Geomaterialia

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The mechanism of coal and rock damage caused by unloading during deep mining differs from that caused by continuous loading, and failure often results from a combination of loading and unloading. Triaxial unloading tests are useful for studying the damage characteristics of coal and rock under different conditions from a unloading point of view to better understand dynamic disasters of deep coal and rock. In this study, we performed triaxial tests involving loading axial stress and unloading confining pressure (4, 7, 10 MPa) using different unloading rates (0.02, 0.05, 0.08, 0.11, 0.14 MPa/s), and acoustic emission (AE) events were recorded simultaneously. The results show that the maximum AE ring and energy counting rates do not appear at peak stress but rather at the stress drop stage following peak stress. Similarly, the maximum AE impact counting rate occurs after the peak stress, which indicates that the internal cracking of the coal samples reaches a maximum at the fracture stage following peak stress. The AE information indicates a relatively quiet period prior to the occurrence of large-scale AE events. Higher initial unloading confining pressure is associated with earlier and more severe failure after peak stress. Faster unloading rates are also associated with earlier sample destruction after peak stress because the coal rapidly changes from a triaxial stress state to a uniaxial stress state with higher unloading rate, crack propagation is insufficient, and more elastic energy is released. Compared with conventional triaxial tests, the coal damage variable increases faster under triaxial unloading tests, which indicates that unloading failure is more severe.

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Section: Methodsmentioning

confidence: 99%

Acoustic emission characteristics of coal under different triaxial unloading conditions

Yang¹

2020

Acta Geodynamica Et Geomaterialia

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“…Underground fracture rock masses consist of the intact rock matrix and various discontinuities. Discontinuities such as joints and fractures play a significant role in the hydro-mechanical behaviors of a host rock mass [1][2][3][4][5][6][7]. Hence, the analysis of the shear-flow behaviors of rock fractures is critical to many mass and energy transport engineering activities, such as nuclear waste disposal, oil, natural gas production, and geothermal energy extraction [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Shear-Flow Coupled Behavior of Tension Fractures Under Constant Normal Stiffness Boundary Conditions

et al. 2019

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This study experimentally investigated the effects of fracture surface roughness, normal stiffness, and initial normal stress on the shear-flow behavior of rough-walled rock fractures. A series of shear-flow tests were performed on two rough fractures, under various constant normal stiffness (CNS) boundary conditions. The results showed that the CNS boundary conditions have a significant influence on the mechanical and hydraulic behaviors of fractures, during shearing. The peak shear stress shows an increasing trend with the increases in the initial normal stress and fracture roughness. The residual shear stress increases with increasing the surface roughness, normal stiffness, and initial normal stress. The dilation of fracture is restrained more significantly under high normal stiffness and initial normal stress conditions. The hydraulic tests show that the evolutions of transmissivity and hydraulic aperture exhibit a three-stage behavior, during the shear process—a slight decrease stage due to the shear contraction, a fast growth stage due to shear dilation, and a slow growth stage due to the reduction rate of the mechanical aperture increment. The transmissivity and hydraulic aperture decreased, gradually, as the normal stiffness and initial normal stress increase.

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“…In soil or rock mass, there are a large number of discontinuous interfaces, which have a variety of forms of existence and mechanical properties. In the dynamic geotechnical engineering, the discontinuous interfaces not only change the mechanical properties of the geo-material [1], but also significantly affect the propagation of stress waves [2]. For some discontinuous interfaces, which can be considered as a medium interface, the displacement field, stress field, is continuous on the discontinuous interface, but the wave impedance is significantly different on both sides of 2 of 20 interface.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slip Surface’s Continuity on Slope Dynamic Stability Based on Infinite Slope Model

2019

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The slip surface is an important control structure surface existing in the landslide. It not only directly affects the stability of the slope through the strength, but also affects the stress field by affecting the propagation of the stress wave. Many research results have been made on the influence of non-continuous stress wave propagation in rock and soil mass and the dynamic response to seismic slopes. However, the effect of the continuity of the slip surface on the slope dynamic stability needs further researches. Therefore, in this paper, the effect of slip surface on the slope’s instantaneous safety factor is analyzed by the theoretical method with the infinite slope model. Firstly, three types of slip surface model were established, to realize the change of sliding surface continuity in the infinite slope. Then, based on wave field analysis, the instantaneous safety factor was used to analyze the effect of continuity of slip surface. The results show that with the decreasing of slip surface continuity, the safety factor does not simply increase or decrease, and is related to slope features, incident wave and continuity of slip surface. The safety factor does not decrease monotonically with the increasing of slope angle and thickness of slope body. Moreover, the reflection of slope surface has a great influence on the instantaneous safety factor of the slope. Research results in this paper can provide some references to evaluate the stability of seismic slope, and have an initial understanding of the influence of structural surface continuity on seismic slope engineering.

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Estimating the support effect of energy-absorbing rock bolts based on the mechanical work transfer ability

Cited by 61 publications

References 25 publications

Acoustic emission characteristics of coal under different triaxial unloading conditions

Acoustic emission characteristics of coal under different triaxial unloading conditions

Experimental Study on the Shear-Flow Coupled Behavior of Tension Fractures Under Constant Normal Stiffness Boundary Conditions

Effect of Slip Surface’s Continuity on Slope Dynamic Stability Based on Infinite Slope Model

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