不同开挖方式下即时型和时滞型岩爆的孕育特征比较

doi:10.13722/j.cnki.jrme.2014.1076

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Abstract

For a case of circular deep-buried tunnel，cracking extent and extending length in surrounding rock masses under blasting and TBM methods are calculated，and energy dissipation during the cracking of surrounding rock masses is analyzed. In addition，based on the index of releasable strain energy，rank and position of rockbursts are determined. Results show that，compared with the quasi-static unloading of in-situ stress caused by tunnel boring machine excavation，the transient release of in-situ stress induced by blasting excavation aggravates the cracking in surrounding rock masses，and enlarges the energy dissipation during this process. This minifies the releasable strain energy after the excavation unloading and brings down the risk of time delayed rockbursts；while during the transient release of in-situ stress，influenced by high aggregation of energy，the releasable strain energy is enhanced，and the risk of immediate rockbursts is enlarged for the blasting excavation.

Key words： rock mechanics tunnel boring machine(TBM) excavation blasting excavation rockburst rock cracking

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	Articles by authors
	FAN Yong1
	2
	LU Wenbo1
	2
	WANG Yichang1
	2
	YAN Peng1
	2
	CHEN Ming1
	2

Cite this article:

FAN Yong1,2,LU Wenbo1, et al. COMPARISON OF EVOLUTION CHARACTERISTICS OF IMMEDIATE AND TIME DELAYED ROCKBURSTS UNDER DIFFERENT EXCAVATION METHODS[J]. , 2015, 34(S2): 3715-3723.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1076 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/3715

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