基于矿震活动规律的重复采动高位硬厚岩层冲击机制探讨

doi:10.13722/j.cnki.jrme.2015.1245

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Abstract Aiming at tremors with large energies during repeated mining induced by instability of super-thick strata，using 200 m red beds as an engineering project in Baodian Coal Mine，rock burst and tremors law of high and thick strata of hard rocks were analyzed. The tremors law show that micro-seismic events which energy below 104 J cut down observably compared to upper coal seam，on the contrary，strong rock burst which energy higher than 105 J effecting mining seriously increased observably. In generally the micro-seismic show out no obvious laws，but strong rock burst appearing at boundary sides observably larger than that in middle zone，and show the same laws in gob side compared with the coal side. Based on tremors law and analyzing characters of reds beds during the first fractured，putting forward two rock burst mechanism in different zone. First，in the middle of working face，because of subsidence space enlarged，vertical load will change suddenly caused shearing strength between rock blocks exceeding limits，finally break stable articulated and balance structure，formed type of shear and slip. Second，at boundary sides，the external expansion of strata movement line caused highly-concentrated stress area，and following cause compaction of fractured strata，finally induced rock burst，formed type of slip and backfill. Two mechanisms give a positive function to each other. The type of slip and backfill act predominant in strong rock burst.

Key words： mining engineering repeated mining high and thick strata of hard rocks type of shear and slip type of slip and backfill strong rock burst

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	Articles by authors
	WANG Shuli1
	ZHANG Kaizhi2
	JIANG Jinquan3
	ZHU Guangli1
	YU Hailing1

Cite this article:

WANG Shuli1,ZHANG Kaizhi2,JIANG Jinquan3, et al. Rock burst mechanism and tremors law of high and thick strata of hard rock during repeated mining[J]. , 2016, 35(S2): 4172-4179.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.1245 OR https://rockmech.whrsm.ac.cn/EN/Y2016/V35/IS2/4172

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