北山坑探设施开挖全过程围岩内部位移现场量测试验研究

doi:10.13722/j.cnki.jrme.2017.1164

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Abstract The excavation of exploration tunnel at Beishan which is to be the test platform for the underground research laboratory of high-level radioactive waste was investigated in order to study the variation of internal displacement in the hard surrounding rock. An in-situ test scheme was designed and the field measuring of internal displacement in surrounding rock was carried out. The variation of the internal displacement in surrounding rock in the whole process of tunnel excavation was analyzed. The analysis of the spatial effect of tunnel face and the estimation of loss displacement was carried out with 3 typical LDP curves of Lee equation，Hoek equation and V-D equation. The research result shows that the internal displacement of surrounding rock in the whole process of blasting excavation goes through 3 stages，including the initial growth，the rapid growth and the stable convergence. The temporal curve of internal displacement in surrounding rock near the monitoring section shows the step characteristics，which is similar to the morphological characteristics of creep curve of rock in stepped loading test. The measuring points far from the side wall of tunnel is less affected by the spatial effect of the tunnel face and the displacement release in front of the tunnel face accounts for a larger proportion. The loss displacement calculated with the Hoek equation is closest to the measured value. When the measuring section was set 2 m away from the tunnel face，the loss displacement accounts for more than 50% of the total displacement.

Key words： rock mechanics Beishan exploration tunnel whole excavation process internal displacement of surrounding rock loss displacement field measuring test

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	Articles by authors
	LI Erbing1
	HAN Yang1
	2
	TAN Yuehu1
	WANG Chuanle1
	DUAN Jianli1
	PU Shikun1
	WANG Jian1

Cite this article:

LI Erbing1,HAN Yang1,2, et al. Field measuring test on internal displacement of surrounding rock during whole excavation process of Beishan exploration tunnel[J]. , 2017, 36(11): 2741-2754.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1164 OR http://www.rockmech.org/EN/Y2017/V36/I11/2741

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