深部巷道煤与瓦斯突出及冲击演化特征试验研究

doi:10.13722/j.cnki.jrme.2021.0974

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Abstract To further reveal the impact failure mechanism of the two-phase flow of coal and gas outburst，the briquette specimens from the Sunjiawan outburst coal seam in Fuxin were made，and simulation tests of deep coal and gas outburst in roadways under different depths(1 000，1 200，1 400，1 600，1 800 and 2 000 m) were carried out by using the self-developed true triaxial coal and gas outburst roadway simulation test system. The relative outburst intensity under the test outburst critical gas pressure was defined as unit outburst intensity. The relationships between the critical gas pressure and the unit outburst intensity with the depth were analyzed，and the variation rules among the critical gas pressure，the effective stress and impact parameters(peak impact force，time to peak，duration of outburst) were obtained. Based on the outburst shock wave front velocity formula，the velocity of the impact flow in the test roadway was inverted. The results show that：(1) When an outburst occurs，the pulverized coal is spewed out violently by high-pressure gas，and outburst coal at different depths gathers within the interval of 0–6.45 m from the outburst mouth. As the depth increases，the mass proportion of the pulverized coal concentration area increases，while with increasing the outburst distance，the mass proportion of the pulverized coal gradually decreases，indicating that the outburst energy gradually decays with the outburst distance and that the pulverized coal settlement after the outburst has sorting characteristics. (2) As the depth increases，the critical gas pressure decreases while the unit outburst strength gradually increases. The greater the depth，the greater the change amplitude，reflecting the low threshold，easy outburst and high strength characteristics of deep coal and gas outburst. (3) The evolution of the impact force in the roadway experiences a process of“rise，peak and decrease”，presenting a“crest effect”. The velocity of the impact flow is 361.61–379.13 m/s，showing obvious turbulence characteristics. The greater the depth，the less obvious the turbulence characteristics. (4) The critical gas pressure and the effective stress have significant influence on impact parameters. The peak of the impact force increases exponentially with the critical gas pressure while linearly decreases with the effective stress. The time to the peak decreases with increasing the critical gas pressure but increases with increasing the effective stress. The duration of outburst increases with increasing the critical gas pressure while decreases with increasing the effective stress.

Key words： mining engineering coal and gas outburst roadway impact force critical gas pressure effective stress

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	TANG Jupeng1
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	ZHANG Xin1
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	PAN Yishan3
	HAO Na1
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Cite this article:

TANG Jupeng1,2,ZHANG Xin1, et al. Experimental study on outburst and impact evolution characteristics of coal and gas in deep roadways[J]. , 2022, 41(6): 1081-1092.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0974 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1081

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