真三维应力状态下煤与瓦斯突出过程中瓦斯压力时空演化规律研究

doi:10.13722/j.cnki.jrme.2020.0093

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Abstract In order to further understand the dynamic phenomenon of coal and gas outburst and its energy release mechanism，a large-scale simulation test system for coupled field coal mine dynamic disasters was used to carry out physical simulation tests of coal and gas outburst under different geostress conditions. The spatiotemporal evolution of gas pressure in coal during the coal and gas outburst and its response to different geo-stress conditions were investigated. The results show that，after the start of the outburst，the gas pressure in the distressed zone produces a cyclical rise to varying degrees during the decrease process. In the distressed zone，the drop rate of the gas pressure in the direction of minimum principal stress increases with increasing the distance from the center of the coal section，while the decrease of the gas pressure shows a downward trend of “simultaneous increase and decrease” in the direction of maximum principal stress. In the stress concentration zone，the drop rate of the gas pressure in the direction of minimum principal stress shows the same law as that of the distressed zone，while the initial moment of the decrease of the gas pressure in the direction of maximum principal stress advances with increasing the geo-stress，which means that the greater the geo-stress，the shorter the time for the outburst to propagate deep into the coal seam. The gas pressure shows a semi-ellipsoidal pressure drop zone in the initial stage of the outburst. The process of the gas pressure drop zone advancing in the deep coal seam during the outburst process is a deceleration process. Nevertheless，with，increasing the geo-stress，the expansion rate of the gas pressure drop zone to deep coal seam increases.

Key words： mining engineering coal and gas outburst triaxial stress gas pressure spatiotemporal evolution

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	PENG Shoujian1
	2
	YANG Wenjian1
	2
	ZHOU Bin1
	2
	XU Jiang1
	2
	CHENG Liang1
	2
	YANG Xiaobo1
	2

Cite this article:

PENG Shoujian1,2,YANG Wenjian1, et al. Study on the evolution law of gas pressure in the process of coal and gas outburst under true triaxial stresses[J]. , 2020, 39(9): 1762-1772.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0093 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I9/1762

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