Nonlinear longitudinal deformation of underlying shield tunnels induced by foundation excavation

被引：0
|
作者：
Kang C. [1 ]
Ye C. [1 ]
Liang R. [1 ,2 ]
Sun L. [3 ]
Fang Y. [1 ]
Wu W. [1 ,2 ]
机构：
[1] Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan
[2] College of Civil Engineering and Architecture, Guangxi University, Nanning
[3] Shanghai Construction Group Co., Ltd., Shanghai
来源：
Sun, Lianwei (erik0711@126.com) | 1600年 / Academia Sinica卷 / 39期
基金：
中国国家自然科学基金;
关键词：
Analytical solution; Foundation excavation; Longitudinal deformation; Nonlinear foundation model; Shield tunnels; Soil mechanics;
D O I：
10.13722/j.cnki.jrme.2020.0529
中图分类号：
学科分类号：
摘要：
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. © 2020, Science Press. All right reserved.
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页码：2341 / 2350
页数：9
相关论文
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