考虑管片环间接头弱化的新建隧道上穿引起既有盾构隧道纵向变形分析

doi:10.13722/j.cnki.jrme.2021.0275

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Abstract Exploring the longitudinal deformation mechanism of the existing shield due to construction of new tunnel above is significant to assess the adverse impacts of above-crossing tunnelling on the existing shield tunnel. Current analytical methods commonly simplify the existing shield tunnel as an equivalent continuous beam resting on a linear elastic foundation，of which will overlook the weakening of circumferential joint and the nonlinear deformation characteristics of the ground. Firstly，the joint discontinuous shield tunnel model and the nonlinear Pasternak foundation model are adopted to consider the weakening of circumferential joint and the tunnel-soil nonlinear interaction. The differential equation for shield tunnel longitudinal deformation owing to above-crossing tunnelling is derived. Secondly，the numerical solution for shield tunnel longitudinal deformation is solved using the finite difference method and the Newton?s iteration method. Finally，the predictions from the proposed method are compared with two field cases and the results predicted by the current equivalent continuous beam model. It shows that the longitudinal deformation and the bending moment based on the equivalent continuous beam model express continuous characteristics. While the longitudinal deformation and the bending moment predicted by the proposed method can reflect the discontinuous characteristics，because the weakening of circumferential joint is considered by the proposed method. The results obtained by the proposed method is much closer to the real shield tunnel deformation characteristics. Through the parametric analyses，it is found that increasing the clearance distance between the new and old tunnels will effectively reduce the tunnel heave，bending moment and joint opening. By increasing the length of segment ring，the tunnel heave will decrease slightly，but the joint opening and bending moment will increase. To increasing the stiffness of the circumferential joint will effectively lead to the decrease of tunnel vertical displacement and opening of joint，but it will increase the bending moment of tunnel.

Key words： tunnelling engineering weakening of circumferential joint above-crossing tunnelling existing shield tunnel joint discontinuous shield tunnel model nonlinear foundation model

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	Articles by authors
	ZHANG Zhiwei1
	LIANG Rongzhu1
	GAO Kun2
	3
	LI Zhongchao4
	XIAO Mingzhao4
	GUO Yang2
	3
	YUE Tengsheng2
	3
	WU Wenbing1

Cite this article:

ZHANG Zhiwei1,LIANG Rongzhu1,GAO Kun2, et al. Analysis of longitudinal displacement of existing shield tunnel due to construction of above-crossing new tunnel considering the weakening of circumferential joint[J]. , 2022, 41(S1): 2955-2970.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0275 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2955

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