膨胀性软岩隧道支护结构受力特性及缓释方法

doi:10.13722/j.cnki.jrme.2022.1173

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Abstract The phenomenon of supporting structure cracking due to the expansive soft rock is common in tunnel engineering. Taking the non-uniform stress of tunnel surrounding rock structure caused by expansive soft rock as the starting point，the stress characteristics of the supporting structure of expansive soft rock tunnels are studied，and a swelling force release method of expansive soft rock tunnel supporting structure is established. The granular bentonite is implanted between the primary support and the secondary lining as the buffer layer，and the model test is carried out. The three-dimensional numerical model is established by MIDAS GTS NX software，and the mechanical characteristics of the expansive soft rock tunnel support structure before and after the buffer layer are comparatively analyzed. According to the tunnel mechanics theory，the swelling force slow-release model of the expansive soft rock tunnel supporting structure is established，and the expression of release coefficient is obtained. The practicability of the slow-release method is verified. The results show that the deformation of the supporting structure and the swelling force of the surrounding rock after adding the buffer layer are significantly smaller than those before adding the buffer layer. The deformation characteristics are characterized by the sinking of the vault，the characteristics of arch bottom upward uplift and the arch waist inward convergence. The buffer layer reduces the swelling force of surrounding rock acting on the supporting structure by resisting，weakening and transferring. Consequently the single concentrated force system is transformed into the uniform load system. The slow-release coefficient calculated by the slow-release model is 30%–50%，indicating that the implantation of granular bentonite as a buffer layer between the initial support and the secondary lining can slow down the swelling force. This research can provide a reference for solving the swelling problem of soft rock tunnels.

Key words： tunnelling engineering expansive soft rock swelling characteristics physical model test numerical simulation swelling force slow-release method

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	Articles by authors
	ZUO Qingjun1
	2
	LI Xinyi1
	2
	ZHAO Xianqiang3
	LI Pan1
	2
	ZHU Sheng4
	HAN Bingxiao2

Cite this article:

ZUO Qingjun1,2,LI Xinyi1, et al. Mechanical characteristics and force slow-release method of support structure of expansive soft rock tunnel[J]. , 2023, 42(9): 2190-2202.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.1173 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I9/2190

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