Influence of non-associated flow rule on face stability for tunnels in cohesive–frictional soils

被引：0

作者：

Zhang, Mingju ^{[1
]}

Di, Qiguang ^{[1
]}

Li, Pengfei ^{[1
]}

Wei, Yingjie ^{[1
]}

Wang, Fan ^{[1
]}

机构：

[1] Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing,100124, China

来源：

Tunnelling and Underground Space Technology | 2022年 / 121卷

关键词：

Circular tunnels - Face stability - Failure mechanism - Failure zone - Limit analysis - Non-associated flow rule - Numerical simulation - Shallow tunnel - Support pressure - Three-dimensional numerical simulations;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

This paper aims at analyzing the influence of non-associated flow rule on face instability of a circular tunnel in cohesive–frictional soils. A series of three-dimensional numerical simulations are performed to analyze the influence of dilatation angle on the limit support pressures and the failure zones. The dilatation angle significantly influences the limit support pressure and the failure zone. Then, a three-dimensional failure mechanism that consists of the ellipsoid and the multi-block is proposed based on the upper-bound theorem. Finally, the limit support pressures and failure zones obtained from the new mechanism are compared with those given by existing approaches of limit analyses, numerical simulation and centrifuge tests. The results indicate that the presented model is more effective in analyzing the face stability of tunnels. © 2021 Elsevier Ltd

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