基坑开挖诱发下卧盾构隧道纵向非线性变形研究

doi:10.13722/j.cnki.jrme.2020.0529

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Abstract Current simplified analytical methods for predicting shield tunnel longitudinal deformation due to excavation commonly adopt elastic foundation model to consider the ground-tunnel interaction and hence，fail to reflect the nonlinear deformation characteristics of subsoils. Introducing nonlinear Pasternak foundation model for considering the tunnel-soil nonlinear interaction，in this paper，a differential equation for shield tunnel longitudinal deformation owing to overlying excavation is derived. The differential equation is transferred into matrix-vector form according to the finite difference method，and then the numerical solution for shield tunnel longitudinal deformation induced by excavation is solved using the Newton¢s iteration method. The applicability and feasibility of the proposed method is verified by three-dimensional finite element simulations and two field cases. The results show that，when the longitudinal heave of shield tunnels induced by excavation is smaller，both the simplified analytical methods based on the Winkler and Pasternak elastic foundation models and the proposed method provide good predictions for shield tunnel longitudinal heave，while that，for a considerable large longitudinal heave of shield tunnel，the proposed method based on the nonlinear Pasternak foundation model always offers a more reliable prediction of the heave of shield tunnels but the simplified methods give a significant underestimation.

Key words： soil mechanics foundation excavation shield tunnels nonlinear foundation model analytical solution longitudinal deformation

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	Articles by authors
	KANG Cheng1
	YE Chao1
	LIANG Rongzhu1
	2
	SUN Lianwei3
	FANG Yuxiang1
	WU Wenbing1
	2

Cite this article:

KANG Cheng1,YE Chao1,LIANG Rongzhu1, et al. Nonlinear longitudinal deformation of underlying shield tunnels induced by foundation excavation[J]. , 2020, 39(11): 2341-2350.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0529 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2341

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