动载频率对砂岩冲击岩爆影响的实验研究

doi:10.13722/j.cnki.jrme.2021.0951

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Abstract After the excavation unloading of rock mass，the formed roadway structures are in a relatively stable state. Disturbed by engineering disturbance，strain energy is accumulated in the rock mass surrounding the roadway. The surrounding rock mass may fail catastrophically under such combined dynamic and static loads，which is defined as impact rockburst. In this paper，the rockburst experiment was carried out under different dynamic load frequencies. Using the image acquisition system，pictures of the whole process of destructive rockburst inside the sample cavern were captured to reveal the destructive characteristics of impact rockburst. Resutls show that the incubation and destruction process of the rockburst can be divided into the calm stage，the particle ejection stage，the local drum stage，the detrital exfoliation stage，the penetration failure stage and the rockburst stage. The cross-section of the blast crater of a rock burst is V-shaped. As the frequency of the dynamic load increases，the damage of the V-shaped blast crater becomes more concentrated，and the blast crater becomes narrower and deeper. The dynamic load frequency thus has a significant impact on the intensity of impact rockburst failure. With increasing the dynamic loading frequency，the acoustic emission increases in the rockburst stage，releasing more strain energy. In addition，the fragmentation degree and the intensity of rockburst also increase with the loading frequency.

Key words： rock mechanics impact rockburst frequency of dynamic loading rockburst pit fragment acoustic emission

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	Articles by authors
	LIU Dongqiao1
	HU Tianxiang1
	2
	WANG Yang1
	3
	LING Kai1
	2
	HAN Zijie1
	2
	HE Manchao1

Cite this article:

LIU Dongqiao1,HU Tianxiang1,2, et al. Experimental study of the effect of loading frequency on the impact rockburst of sandstone[J]. , 2022, 41(7): 1310-1324.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0951 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1310

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