Experimental study on the influence of weak medium in block rock mass partings on the pendulum wave propagation
WANG Kaixing1,2, XUE Jiaqi1, PAN Yishan1, DOU Linming2, JIA Baoxin1
1.School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China;
2.Key Laboratory of Deep Coal Resource Mining (CUMT) Ministry of Education, China University of Mining Technology, Xuzhou 221116, China
Abstract：Block rock mass is composed of rock and weak medium between them, so there is a nonlinear dynamic propagation of pendulum wave in block rock mass. The propagation of pendulum wave is low frequency, low speed and large amplitude. Among them, weak medium between rock blocks is an important factor that affects the dynamic propagation characteristics of pendulum wave. This paper is based on the experiment of dynamic propagation of pendulum wave in block rock mass. The influence of elastic modulus and thickness of weak medium between rock blocks on the dynamic propagation of pendulum wave in block rock mass under a certain impact energy is analyzed. The time and frequency domain responses of wave propagation velocity, block acceleration, kinetic energy and displacement are obtained. The results show that: When the elastic modulus of the weak medium between rock blocks is larger, the speed of pendulum wave is faster, the amplitude of acceleration and kinetic energy of the block is large, and the displacement amplitude decreases, and the response time width of acceleration signal decreases obviously. At the same time, the maximum attenuation rates of acceleration, kinetic energy and displacement of the block increase significantly during the propagation of pendulum wave. With the increase of elastic modulus of the soft medium, the acceleration frequency domain response bandwidth, center frequency and maximum frequency of two measuring points increase, and the vibration frequency of the block increases; When the weak medium between blocks becomes thicker, the pendulum wave propagation speed becomes slower. The block kinetic energy and displacement amplitude increase, the time width of acceleration signal increases, the attenuation of kinetic energy and displacement is more obvious, the acceleration attenuation rate increases slightly, the acceleration frequency domain response bandwidth and center frequency decrease, and the block vibration frequency decreases. Considering the elastic modulus and thickness of weak medium, the low-frequency and low-speed propagation characteristics of pendulum wave will be more prominent when the elastic modulus of weak medium between rock blocks becomes smaller or the weak medium becomes thicker. The study of this paper will provide a reference for the analysis of dynamic response characteristics of block rock mass and wave monitoring of rock mass engineering.
王凯兴1，2，薛佳琪1，潘一山1，窦林名2，贾宝新1. 岩块间软弱介质对块系岩体摆型波传播影响实验研究[J]. 振动与冲击, 2022, 41(24): 298-304.
WANG Kaixing1,2, XUE Jiaqi1, PAN Yishan1, DOU Linming2, JIA Baoxin1. Experimental study on the influence of weak medium in block rock mass partings on the pendulum wave propagation. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(24): 298-304.
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