| 非均质黏土地层隧道开挖面稳定运动单元上限有限元分析 |
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| 引用本文： | 杨峰,何诗华,吴遥杰,计丽艳,罗静静,阳军生.非均质黏土地层隧道开挖面稳定运动单元上限有限元分析[J].岩土力学,2020(4):1412-1419,1436. |
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| 作者姓名： | 杨峰 何诗华 吴遥杰 计丽艳 罗静静 阳军生 |
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| 作者单位： | 中南大学土木工程学院;中南大学重载铁路工程结构教育部重点实验室 |
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| 基金项目： | 国家自然科学基金(No.51878669)。 |
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| 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γD/cu0、土体强度非均质参数ρD/cu0等因素综合影响下开挖面失稳临界荷载上限解σs/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ρD/cu0对临界荷载σs/cu0及地层破坏模式影响显著;土体重度参数γD/cu0对σs/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。
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| 关 键 词： | 隧道开挖面稳定 非均质黏土 上限有限元 临界荷载 破坏机制 |
Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay |
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| YANG Feng,HE Shi-hua,WU Yao-jie,JI Li-yan,LUO Jing-jing,YANG Jun-sheng.Tunnel face stability analysis by the upper-bound finite element method with rigid translatory moving element in heterogeneous clay[J].Rock and Soil Mechanics,2020(4):1412-1419,1436. |
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| Authors: | YANG Feng HE Shi-hua WU Yao-jie JI Li-yan LUO Jing-jing YANG Jun-sheng |
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| Institution: | (School of Civil Engineering,Central South University,Changsha,Hunan 410075,China;Key Laboratory of Engineering Structure of Heavy Railway of Ministry of Education,Central South University,Changsha,Hunan 410075,China) |
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| 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 loadσs/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 parameterγD/cu0 and the heterogeneous parameterρD/cu0.The results reveal that C/D andρD/cu0 have a significant effect onσs/cu0 and failure mechanism.γD/cu0 has a great influence onσs/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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| Keywords: | tunnel face stability heterogeneous clay upper-bound finite element critical load failure mechanism |
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