Abstract
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.
Highlights
Due to the gradual depletion of shallow resources, deep mining has become the main direction of global resource development
The phenomenon produced by deep rock mass is different from that of shallow rock mass, in which the anomalously low-friction effect is one of the main scientific phenomena of dynamic characteristics of the deep rock mass engineering response. e dynamic impulse acts on the rock block system to make the rock mass vibrate, which causes the relative compaction degree between the rock blocks to change, and, in consequence, the friction between the rock blocks will be greatly reduced, resulting in the friction “disappear” effect [1]. e deep block rock mass is more prone to translation and rotation due to this scientific phenomenon, which leads to anomalously low-friction sliding instability of the rock mass
A vertical impact and confining pressure are applied to the superimposed block model, and a horizontal static force is applied to the working block. e horizontal displacement of the working block and the normal force on the contact surface are considered as the characteristic parameters of the anomalously low-friction effect. e effects of vertical impact energy, confining pressure, and block lithology on the characteristic parameters under vertical impact disturbance are analyzed. e conclusions obtained have important practical application value for the prediction and prevention of anomalously low-friction rock burst
Summary
Due to the gradual depletion of shallow resources, deep mining has become the main direction of global resource development. E deep block rock mass is more prone to translation and rotation due to this scientific phenomenon, which leads to anomalously low-friction sliding instability of the rock mass. It will induce dynamic disasters such as anomalously low-friction rock burst. Ey verified the existence of the anomalously low-friction effect by establishing a dynamic model of block rock mass. Ese research results were more from the perspective of verifying the existence of the anomalously low-friction effect and revealing the mechanism of the anomalously low-friction effect, mainly based on experimental analysis. E horizontal displacement of the working block and the normal force on the contact surface are considered as the characteristic parameters of the anomalously low-friction effect. A vertical impact and confining pressure are applied to the superimposed block model, and a horizontal static force is applied to the working block. e horizontal displacement of the working block and the normal force on the contact surface are considered as the characteristic parameters of the anomalously low-friction effect. e effects of vertical impact energy, confining pressure, and block lithology on the characteristic parameters under vertical impact disturbance are analyzed. e conclusions obtained have important practical application value for the prediction and prevention of anomalously low-friction rock burst
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