Mechanism of anomalous low friction phenomenon in deep block rock mass

Wu, Hao; Fang, Qin; Zhang, Yadong; Lu, Yu-Sheng; Liu, Jinchun

doi:10.1016/s1674-5264(09)60077-6

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Wang et al 16 indicated that block interface effects depend on block size and the bulk deformation capacity within blocks and at interfaces. Wu et al 17 found vertical stress and friction coefficient change in blocks induce slip instability in rock masses. Xu et al 18 experimentally studied on friction weakened effect of deep block rock mass and found displacement versus horizontal force is parabolic under vertical impact and static horizontal loading.…”

Section: Introductionmentioning

confidence: 99%

Slip instability behavior of block rock masses on dynamic-static combined loads

Wang

Shi

Pan

et al. 2023

Sci Rep

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A rock mass is a system of various scale blocks embodied into one another. Inter-block layers are usually composed of weaker and fissured rocks. On the action of dynamic-static loads, it can induce slip instability between blocks. In this paper, the slip instability laws of block rock masses are studied. Based on theory and calculation analysis finding that the friction force between rock blocks varies with block vibration and the friction between rock blocks can drop sharply, resulting in slip instability. The critical thrust and occurrence time of block rock masses slip instability are proposed. The factors affecting block slipping instability are analyzed. This study has significance to the rock burst mechanism induced by slip instability of rock masses.

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Section: Introductionmentioning

confidence: 99%

Slip instability behavior of block rock masses on dynamic-static combined loads

Wang

Shi

Pan

et al. 2023

Sci Rep

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“…It is necessary to strengthen research on the mechanism and rules of the anomalously low-friction effect [1]. Wu et al studied the wave characteristics of block media from an experimental perspective [17]. He et al obtained the friction variation characteristics of a granite block with a hole in the center, which verified the existence of the anomalously lowfriction effect [18].…”

Section: Introductionmentioning

confidence: 99%

Influencing Factor Analysis on the Anomalously Low‐Friction Effect in the Block Rock Mass

Yi-shan

et al. 2020

Advances in Civil Engineering

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According to the instability failure of the deep rock mass, a superposition block model of anomalously low-friction effect was established. The numerical results were compared with the previous experiment, which verifies the feasibility and effectiveness of the simulation. A vertical impact and confining pressure were applied to the superimposed block model, and a horizontal static force was applied to the working block (the third block). This study aimed to determine the influence rules of vertical impact energy, confining pressure, and block lithology on the horizontal displacement of the working block and normal force on the contact surface. The results show that, with the increase of the vertical impact energy, the horizontal residual displacement of the working block increases linearly, and the horizontal displacement amplitude increases by the exponential function. The minimum normal force on the contact surface decreases linearly. As the confining pressure increases, the horizontal residual displacement of the working block decreases logarithmically, and the horizontal displacement amplitude decreases linearly. The minimum normal force on the contact surface increases linearly. The horizontal residual displacement and displacement amplitude of the working block in the coal-rock combination are 1.51 times and 1.63 times of the rock mass, and the minimum normal force of the former is 0.84 times of the latter. Coal-rock combination is more prone to the anomalously low-friction effect than the rock mass.

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“…e theoretical model was adopted and further improved by Wang et al [15,16] to derive the analytical expression of horizontal displacement of working block and reveal the mechanism of the anomalously low-friction effect.…”

Section: Introductionmentioning

confidence: 99%

Influence of Bidirectional Impact Loading on Anomalously Low‐Friction Effect in Block Rock Media

Tang

et al. 2018

Advances in Civil Engineering

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The anomalously low-friction effect is a key scientific problem in deep mining. The deep coal rock media is usually a block structure with joint fracture. When the deep block coal rock is subjected to repeated strong dynamic impact caused by long-term excavation activities, the anomalously low-friction effect will occur, resulting in dynamic disasters such as rock bursts. Taking granite block rock media as research object and using bidirectional impact loading to simulate the dynamic disturbance of rock media, a numerical model was established. The vertical acceleration and the horizontal displacement on working block media were defined as the characteristic parameters of the anomalously low-friction effect. The effects of delay time and horizontal impact loading amplitude and frequency on the characteristic parameters under bidirectional impact loading were examined by numerical simulation. The generation and variation of the anomalously low-friction effect of block rock media subjected to bidirectional impact loading were presented. The results show that the delay time has a significant effect to the vertical acceleration amplitude and horizontal displacement on the working block media under bidirectional impact loading. There exists a delay time threshold; when reach to the threshold, quasiresonance and the anomalously low-friction effect on block media will easily occur. With the increase in horizontal impact amplitude, the residual horizontal displacement on the working block media also increases by power function, while it decreases by power function with the increase of horizontal impact loading frequency. Finally, this study denotes that it is great significance to investigate the bidirectional impact loading in order to capture the mechanism of anomalously low-friction effect.

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Mechanism of anomalous low friction phenomenon in deep block rock mass

Cited by 4 publications

References 11 publications

Slip instability behavior of block rock masses on dynamic-static combined loads

Slip instability behavior of block rock masses on dynamic-static combined loads

Influencing Factor Analysis on the Anomalously Low‐Friction Effect in the Block Rock Mass

Influence of Bidirectional Impact Loading on Anomalously Low‐Friction Effect in Block Rock Media

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