Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay

YANG Feng; HE Shi-hua; WU Yao-jie; JI Li-yan; LUO Jing-jing; YANG Jun-sheng

doi:10.16285/j.rsm.2019.0659

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Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay

更新时间：2026-06-25

- Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay
- Vol. 41, Issue 4, Pages: 1412-1419(2020)
- 作者机构：
  
  1. 中南大学土木工程学院,湖南,长沙,410075
  2. 中南大学重载铁路工程结构教育部重点实验室,湖南,长沙,410075
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.0659
  CLC： U451
- Online First：02 July 2020，
  
  Published：2020
- 稿件说明：
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YANG Feng, HE Shi-hua, WU Yao-jie, et al. Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay[J]. 2020, 41(4): 1412-1419.
DOI：

YANG Feng, HE Shi-hua, WU Yao-jie, et al. Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay[J]. 2020, 41(4): 1412-1419. DOI： 10.16285/j.rsm.2019.0659.

摘要

将刚体平动运动单元上限有限元方法（UBFEM-RTME）与程序作进一步改进，使之适应分析非均质黏土地层稳定性问题。应用该程序系统分析了地表超载作用下非均质黏土地层隧道开挖面稳定性，获得了隧道埋深比C/D、土体重度参数?D/cu0、土体强度非均质参数?D/cu0等因素综合影响下开挖面失稳临界荷载上限解?s /cu0图表和以有效间断线网表征的地层破坏模式及其演变规律。研究表明：隧道埋深比C/D和强度非均质参数?D/cu0对临界荷载?s /cu0及地层破坏模式影响显著；土体重度参数?D/cu0对?s /cu0影响明显，但对破坏形态影响不大。进一步展示了不同有效间断线数目及分布等网格参数下地层破坏形态的差异，解释了上限解精度提高的原因，与多块体上限法及上下限有限元法对比表明，UBFEM-RTME适宜于非均质黏土地层隧道开挖稳定性评价研究，特别是极限状态破坏模式的分析。

Abstract

The upper-bound finite element method with rigid translatory moving elements (UBFEM-RTME) is further improved to optimise its suitability for analysing the stability in heterogeneous clay. The method is applied to investigate the stability of the tunnel face in undrained clay layer subjected to surface surcharge. The variation of stability load ?s /cu0 and the morphological characteristics and discipline of the effective discontinuities mechanism are obtained for various combinations of dimensionless buried depth ratio C/D

dimensionless gravity parameter ?D/cu0 and the heterogeneous parameter ?D/cu0. The results reveal that C/D and ?D/cu0 have a significant effect on ?s /cu0 and failure mechanism. ?D/cu0 has a great influence on ?s /cu0 but has little effect on failure mechanism. Furthermore

the UBFEM-RTME is used to show the changes of mesh failure modes under different mesh parameters such as the number and distribution of effective discontinuities

and the reasons for improving the accuracy of the upper bound solution are also explained. The applicability of UBFEM-RTME in heterogeneous clay

especially the analysis of failure mode under the limit state

is verified in comparison with the existing rigid-block upper-bound limit analysis methods and finite element bound method.

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