承压溶腔对隧道开挖稳定性影响的模型试验

doi:10.13722/j.cnki.jrme.2016.0082

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Abstract

Scaled model tests were carried out for a 3-lanes highway tunnel to investigate the stability of tunnel excavation nearby karst cave with internal pressure. Characteristics of tunnel convergence，steel arch internal force，surrounding rock pressure behind primary support and surrounding rock strain influenced by karst cave in different position are acquired in the process of tunnel excavation under certain cavity size and the internal pressure. The condition of no karst cave is also compared. The result shows that：the size order of tunnel vault final subsidence is vault subsidence of no cave＞vault subsidence of karst cave on vault＞vault subsidence of karst cave on side wall＞vault subsidence of karst cave on invert，the size order of tunnel side wall final horizontal convergence is convergence of karst cave on invert＞convergence of karst cave on vault＞convergence of no cave＞ convergence of karst cave on side wall. Comparing with the condition of no karst cave，the existence of adjacent karst cave increases the bending moment of steel arch，the inhomogeneity of axial force distribution and the eccentricity，which is not conducive to the stability of primary support structure. Meanwhile，the existence of karst cave locally reduces the stratum resistance and the surrounding rock pressure，increases the inhomogeneity of the strained condition of primary support. The existence of karst cave forms a certain range of stress concentration zone around the cave，greatly changes the strain distribution of surrounding rock between tunnel and karst cave， which is not conducive to the stability of surrounding rock in this zone.

Key words： tunnelling engineering karst strata model test primary support surrounding rock strain excavation stability

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	Articles by authors
	LIUShubin1
	2
	FANG Yong1
	ZHOU Chaoyue1
	3
	DENG Ruyong1

Cite this article:

LIUShubin1,2,FANG Yong1, et al. Model test of tunnel excavation stability influenced by concealed cave with internal water pressure[J]. , 2017, 36(S2): 3781-3791.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0082 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/3781

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