应力波作用下含大型结构面岩体垮塌动力失稳机制

doi:10.13722/j.cnki.jrme.2021.0395

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Abstract Discontinuous structural planes have great influence on the propagation of explosion stress waves in rock mass，and studies on the dynamic collapse mechanism of rock mass with large structural planes under stress waves provide a theoretical basis for mining and stability control of rock mass under geological structure conditions. Based on the collapse of adjacent 56–#7 pillar stope induced by stoping in 56–#8 room stope of Dongguashan Copper Mine，a mechanical model of shear slip instability of structural planes is established. Based on Mohr-Coulomb strength criterion，the transmission and reflection coefficients of explosion stress waves passing through a structural plane are calculated by theoretical analysis method，and the stress response characteristics of stress waves passing through a structural plane are analyzed. The energy criterion and the stress criterion of shear slip are derived，and the condition of shear instability is obtained. By weakening the shear strength parameters of structural planes，the damage law of structural planes caused by millisecond blasting is analyzed. As is shown by the research findings：(1) when the incident angle is in a certain range，the reflected wave does not have phase delay，the energy dissipation coefficient is greater than 0，and the structural plane shear slip occurs，(2) the shear slip instability of the structural plane is related to the shear strength parameters(internal friction angle and cohesion)，the incident angle of stress waves and the distance between the blasting source and the structural plane，and the farther the blasting source is from the structural plane，the larger the shear strength parameters of the structural plane and the less prone to shear slip instability，and (3) when the parameters of the structural plane reach the critical condition of shear slip，the stope of 56–#7 pillar collapses.

Key words： mining engineering dynamic instability explosion stress wave transmission and reflection coefficient energy criterion stress criterion

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	LIU Xiao1
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	HUA Xinzhu1
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	HUANG Zhiguo4
	YANG Peng4
	YANG Sen1
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	CHANG Guanfeng1
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Cite this article:

LIU Xiao1,2,3, et al. Dynamic collapse mechanisms of rock mass with large structural planes under stress waves[J]. , 2021, 40(10): 2003-2014.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0395 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I10/2003

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