急倾斜巨厚煤层开采深度影响的覆岩能量演化规律研究

doi:10.13722/j.cnki.jrme.2022.0567

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Abstract Aiming at the problem of energy change and transmission under the influence of the mining depth in steeply inclined extra-thick coal seam，the physical simulation experiment method and microseismic monitoring equipment were used to analyze the energy distribution and its change characteristics. By cluster analysis of microseismic events，the energy migration path affected by the mining depth is clarified，and the influence law of the mining depth on the elastic energy and the horizontal stress of steeply inclined coal and rock mass is obtained by numerical simulation experiment. The dynamic response characteristics of energy induced by the deep mining are mastered，and the concept and strategy of power disaster prevention and control in steeply inclined extra-thick coal seam are formed. The results show that with the increase of the mining depth of steeply inclined extra-thick coal seam，the peak energy and concentration degree in concentrated areas obviously increase，and the number and proportion of microseismic energy，frequency and large energy events obviously increase. The bent loaded energy storage head of coal and rock is mainly located in the range of the clamping rock pillar in the mining level of fully mechanized top-coal caving face and the two mining stages above it. The energy is mainly conducted along the clamping rock pillar as the dominant path. And in the process of deep mining，the focal center gradually shifts from the middle of the rock pillar to both ends. The peak energy density of steep coal rock mass and the area of high energy accumulation area all increase with the increase of mining depth. When the mining face reaches +400 level，the peak stress increases by about 30.14% compared with +475 level，and the growth rate is about 0.11 MPa/m. With the increase of mining depth，the maximum horizontal stress variation of the single advance of the working face obviously increases，that is，the loading rate of the working face increases under the single advance. Through the comprehensive analysis of simulation experiment and field microseismic measurement，this paper reveals the mechanism of“Target source-predominant conduction path-release terminal”of dynamic disasters in deep mining of steeply inclined extra-thick coal seam，and puts forward the concept of dynamic disaster prevention and control of deep mining in steeply inclined extra-thick coal seam with“Weaken the source-transfer the path-and strengthen the terminal”. The research results provide a scientific basis for the safe mining of steeply inclined extra-thick coal seam.

Key words： mining engineering steeply inclined extra-thick coal seam mining depth energy evolution microseismic monitoring energy transmission

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	LAI Xingping1
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	JIA Chong1
	2
	CUI Feng1
	2
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	ZHANG Nan1
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	CHEN Jianqiang4
	SUN Jingxuan1
	2
	ZHANG Suilin1
	2
	FENG Ganggui1
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Cite this article:

LAI Xingping1,2,JIA Chong1, et al. Study on the evolution law of overburden energy of steeply inclined extra-thick coal seam influenced by mining depth[J]. , 2023, 42(2): 261-274.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0567 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I2/261

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