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Undrained stability analysis of dual unlined horseshoe-shaped tunnels in non-homogeneous clays using lower bound limit analysis method
Computers and Geotechnics ( IF 5.3 ) Pub Date : 2021-02-26 , DOI: 10.1016/j.compgeo.2021.104057
Rui Sun , Junsheng Yang , Shouhua Liu , Feng Yang

A rigorous adaptive lower bound limit analysis method with 3-noded element (LB-FELA) is adopted to discuss the tunnel stability and failure mechanism of dual unlined horseshoe-shaped tunnels in non-homogeneous clays. The clays mass has heterogeneity, where the shear strength increases linearly with depth. This problem is defined as a plane strain analysis model. The calculation results are provided using the dimensionless stability numbers, which are affected by dimensionless parameters C/D, S/D and ρD/c0.The typical failure mechanisms of the dual horseshoe-shaped tunnels are presented based on the parametric studies using the final refined meshes of the proposed method. The results show that the dimensionless parameters ρD/c0, C/D,and S/D have great influences on tunnel stability and failure mechanism of the dual horseshoe-shaped tunnels. Using the calculation results provided by this paper, the tunnel designers can directly evaluate the stability of the tunnel in non-homogeneous clays.



中文翻译:

应用下限分析法分析非均质黏土中双单衬马蹄形隧道的不排水稳定性

采用严格的三节点自适应下界分析法(LB-FELA),探讨了非均质黏土中双单衬马蹄形隧道的稳定性和破坏机理。粘土块具有非均质性,其中剪切强度随深度线性增加。这个问题被定义为平面应变分析模型。计算结果是使用无量纲稳定性数提供的,该数受无量纲参数的影响C/d小号/dρd/C0通过对所提方法的最终细化网格进行参数研究,提出了双马蹄形隧道的典型破坏机理。结果表明,无量纲参数ρd/C0C/d,和 小号/d对双马蹄形隧道的稳定性和破坏机理影响很大。利用本文提供的计算结果,隧道设计人员可以直接评估非均质黏土中隧道的稳定性。

更新日期:2021-02-26
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