Determination of minimum cover depth for shallow tunnel subjected to water pressure
来源期刊：中南大学学报(英文版)2013年第8期
论文作者：HUANG Fu(黄阜) QIN Chang-bing(覃长兵) LI Shu-cai(李术才)
文章页码：2307 - 2313
Key words：shallow underwater subway; roof collapse; nonlinear failure criterion
Abstract: Prediction of the state of roof collapse is a big challenge in tunnel engineering, while the limit analysis theory makes it possible to derive the analytical solutions of the collapse mechanisms. In this work, an exact solution of collapsing shape in shallow underwater tunnel is obtained by using the variation principle and the upper bound theorem based on nonlinear failure criterion. Numerical results under the effect of river water and supporting pressure are derived and discussed. The maximum water depth above the river bottom surface is determined under a given buried depth of shallow cavities and the critical depth of roof collapse is obtained under a constant river depth. In comparison with the previous results, the present solution shows a good agreement with the practical results.
HUANG Fu(黄阜)1, QIN Chang-bing(覃长兵)2, LI Shu-cai(李术才)3
(1. School of Civil Engineering and Architecture, Changsha University of Science and Technology,
Changsha 410004, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China;
3. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China)
Abstract:Prediction of the state of roof collapse is a big challenge in tunnel engineering, while the limit analysis theory makes it possible to derive the analytical solutions of the collapse mechanisms. In this work, an exact solution of collapsing shape in shallow underwater tunnel is obtained by using the variation principle and the upper bound theorem based on nonlinear failure criterion. Numerical results under the effect of river water and supporting pressure are derived and discussed. The maximum water depth above the river bottom surface is determined under a given buried depth of shallow cavities and the critical depth of roof collapse is obtained under a constant river depth. In comparison with the previous results, the present solution shows a good agreement with the practical results.
Key words:shallow underwater subway; roof collapse; nonlinear failure criterion
