穿越活动断裂带螺旋隧道抗错性能模型试验研究

doi:10.13722/j.cnki.jrme.2024.0128

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Abstract The fault dislocation effect on the tunnel is of significance when a spiral tunnel crosses active fault zones in the western regions of China. In order to clarify the dislocation response of fault-crossing spiral tunnels subjected to the normal faulting，three groups of model tests with different radius of curvature with the longitudinal slope of 3% were performed experimentally，where the critical design parameters of spiral tunnels and the relative stiffness ratio of soil-structure were considered. And then，a rubber-steel flexible joint with certain flexural bearing capacity was utilized on spiral tunnel to explore the anti-dislocation response of tunnel. The performances of tunnel with or without flexible joint measures were subsequently compared and analyzed. The results show that the tunnel near the fault plane and the interface of fault zone and hanging wall are affected by the normal faulting and the tunnel invert is more adverse. The incremental strain at the haunch of the spiral tunnel with the increase of fault dislocation is related to the radius of curvature. The circumferential strain at the haunch with a small radius of curvature and the longitudinal strain at the tunnel crown and invert are more sensitive to the fault dislocation. Affected by the rubber-steel flexible joints with certain bearing capacity，the segmental design of spiral tunnel plays a good adaptability to fault dislocation，especially for the stress reduction on the tunnel invert. The research results can provide a design reference for the fault-crossing spiral tunnels to adapt the fault dislocation in western mountainous areas of China.

Key words： tunnel engineering tunnel curvature fault fracture zone longitudinal slope four-point bending loading test anti-dislocation measurement

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	Articles by authors
	WANG Tianqiang1
	2
	GENG Ping1
	2
	HE Chuan1
	2
	WANG Qi1
	2
	3

Cite this article:

WANG Tianqiang1,2,GENG Ping1, et al. Model test research on anti-dislocation performance of spiral tunnels crossing active fault zones[J]. , 2024, 43(11): 2738-2752.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2024.0128 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I11/2738

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