深部椭圆形洞室围岩冲击岩爆实验研究

doi:10.13722/j.cnki.jrme.2021.0574

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Abstract Using a self-developed impact rockburst equipment，the rockburst phenomena of surrounding sandstone of elliptical caverns under true triaxial loading were reproduced. The stress acquisition system，real-time video recording system and acoustic emission(AE) system were used to investigate the sandstone rockburst failure. Specifically，the failure characteristics such as stresses，fragments，rockburst pits，velocity field and AE were discussed in detail. The results show that the process of impact rockburst of surrounding sandstone of elliptical caverns can be divided into four stages，i.e.，quiet period，small particle ejection，spalling and rockburst. Additionally，the disturbance loading makes the tangential stress of the surrounding rock increase rapidly(beyond the uniaxial compression strength)，which promotes the violent rockburst phenomenon. Furthermore，the lengths of most rockburst fragments are larger than 5 mm，and the dominant shape of the fragments is flake，which is similar to the distribution characteristics of rockburst fragments in field. Moreover，the V-shape pits are symmetrically distributed on the left and right side walls of the cavern，and their positions are perpendicular to the disturbance direction. The velocity field shows a trend of increasing and then decreasing during the both stages of spalling and rockburst，and the velocity reaches the peak at rockburst. Finally，the AE count rate is closely related to the number of loading directions，and the AE count rate and the cumulative count both increase rapidly at the rockburst stage. The main frequency band of AE gradually becomes narrow with decreasing the number of load directions，and the main frequency is mainly distributed between 100 to 200 kHz. The low-frequency(40–70 kHz)，high-frequency and ultra-high-frequency AE signals all appear at the rockburst stage，confirming the complexity of rockburst.

Key words： rock mechanics impact rockburst elliptical caverns rockburst pit rockburst fragments velocity field acoustic emission

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	Articles by authors
	WANG Yang1
	2
	3
	HE Manchao3
	LIU Dongqiao3
	LING Kai3
	REN Fuqiang4

Cite this article:

WANG Yang1,2,3, et al. Experimental study on impact rockburst of surrounding rock in deep elliptical caverns[J]. , 2021, 40(11): 2214-2228.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0574 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I11/2214

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