A study on the propagation law of pendulum-type wave in block-rock mass considering bimodulus characteristics

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (24) : 171-178.

JIANG Kuan1,2,QI Chengzhi2,LU Zhenhui2,CUI Yingjie2,LI Taihang2

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Abstract

The pendulum-type wave is a unique rock mass dynamic phenomenon in deep rock mass engineering, which is easy to cause deep rock engineering disasters of rockburst.According to the characteristics of heterogeneity of deep block-rock mass, the law of pendulum-type wave propagation was studied in block rock mass with bimodulus characteristics based on the block-hierarchical theory of deep rock mass and the improved central difference method.The influence of the modulus ratio on the law of pendulum-type wave propagation was analyzed.The research shows that the modulus ratio has little effect on the amplitude of the positive displacement of the block, but has a greater influence on the amplitude of the negative displacement.The maximum value of block displacement decays slowly in the middle and front area, while it decays rapidly at the end, and the block displacement with different modulus ratio tends to converge at the end.The modulus ratio has no obvious effect on the amplitude of velocity response, but it can increase the period of velocity response.With the decrease of the modulus ratio, the acceleration response appears as a phenomenon of “clustering” of the pendulum-type wave, which was proved by experiment.Finally, based on the theory of pendulum wave, two suggestions for preventing rockburst disasters were proposed: one is to enhance the integrity of the surrounding rock of the roadway; the other is to improve the traditional roadway support method, considering anti-impact performance and fatigue resistance of the supporting structure.Pendulum-type wave in block rock mass with bimodulus characteristics is of great significance to the study of dynamic properties of complex and heterogeneous deep rock mass and ensure engineering safety.

Key words

block-rock mass / pendulum-type wave / rockburst / bimodulus characteristics；dynamic response； improved central difference method / surrounding rock of the roadway

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JIANG Kuan1,2,QI Chengzhi2,LU Zhenhui2,CUI Yingjie2,LI Taihang2. A study on the propagation law of pendulum-type wave in block-rock mass considering bimodulus characteristics[J]. Journal of Vibration and Shock, 2020, 39(24): 171-178

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