轴力和弯矩共同作用下盾构隧道纵向非线性等效抗弯刚度研究

doi:10.13722/j.cnki.jrme.2017.0386

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Abstract In practice，the bending moment and axial forces in the longitudinal direction of shield tunnel may exist simultaneously. The traditional method evaluating the equivalent bending stiffness under the conditions of pure bending may bring errors. In this paper，5 kinds of bending modes have been proposed to consider the combined effect of axial force and bending moment on longitudinal bending deformation. Furthermore，a model calculating the longitudinal equivalent bending stiffness of shield tunnel was established based on the classical SHIBA model. A computer program was written for the implementation of the model. The shield tunnel of Metro Line 3 in Chengdu as was analyzed. The practical method of determining the bending modes was discussed, the critical bending moment in deformation process，and the internal force condition of linear or nonlinear bending deformation were given. The results show that the process of longitudinal deformation of shield tunnel with bending moment can be divided into four categories according to the axial forces. The development of the equivalent bending stiffness and the opening of segment ring are very different. The axial forces has a significant effect on the equivalent bending stiffness，generally，the compression bending >> pure bending＞stretch bending.

Key words： tunnelling engineering shield tunnel longitudinal equivalent stiffness model the combined effect of axial force and bending moment nonlinear equivalent bending stiffness

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	GENG Ping
	CHEN Pingliang
	ZHANG Jing
	HE Chuan
	YAN Qixiang

Cite this article:

GENG Ping,CHEN Pingliang,ZHANG Jing, et al. Nonlinear longitudinal equivalent bending stiffness of shield tunnel under the combined effect of axial force and bending moment[J]. , 2017, 36(10): 2522-2534.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0386 OR http://www.rockmech.org/EN/Y2017/V36/I10/2522

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