首页|Sliding behaviors of the trapezoidal roof rock block under a lateral dynamic disturbance

Sliding behaviors of the trapezoidal roof rock block under a lateral dynamic disturbance

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The surrounding rock of underground space is always affected by external dynamic disturbance from the side position,such as blasting vibration from a stope at the same level or seismic waves from adjacent strata.A series of laboratory tests,numerical simulations and theoretical analyses were carried out in this study to disclose the sliding mechanism of roof rock blocks under lateral disturbance.Firstly,the ex-periments on trapezoidal key block under various clamping loads and disturbance were conducted,followed by numerical simulations using the fast Lagrangian analysis of continua(FLAC3D).Then,based on the conventional wave propagation model and the classical shear-slip constitutive model,a theo-retical model was proposed to capture the relative displacement between blocks and the sliding displacement of the key block.The results indicate that the sliding displacement of the key block increased linearly with the disturbance energy and decreased exponentially with the clamping load when the key block was disturbed to slide(without instability).Meanwhile,when the key block was disturbed to fall,two types of instability process may appear as immediate type or delayed type.In addition,the propagation of stress waves in the block system exhibited obvious low-velocity and low-frequency characteristics,resulting in the friction reduction effect appearing at the contact interface,which is the essential reason for the sliding of rock blocks.The results can be applied to practical un-derground engineering and provide valuable guidance for the early detection and prevention of rock-falling disasters.

Lateral dynamic disturbanceTrapezoidal rock block systemLow-velocity and low-frequency waveFriction reduction effectInstability mode

Feng Dai、Wancheng Zhu、Min Ren、Shunchuan Wu、Leilei Niu

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Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming,650093,China

Center for Rock Instability and Seismicity Research,Department of Mining Engineering,School of Resource and Civil Engineering,Northeastern University,Shenyang,110819,China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaYunnan Major Scientific and Technological Projects

2022YFC290390352304132202202AG050014

2024

10.1016/j.jrmge.2023.10.008

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(3)
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