隧道围岩压力运动单元上限有限元计算方法

石钰锋; 徐长节; 杨峰; 罗静静; 阳军生

doi:10.11779/CJGE201911009

隧道围岩压力运动单元上限有限元计算方法 English Version

石钰锋^1,2,
徐长节^1, ,,
杨峰^3,4,
罗静静³,
阳军生^3,4

1. 华东交通大学江西省岩土工程基础设施安全与控制重点实验室,江西南昌 330013;
2. 南昌轨道交通集团有限公司,江西南昌 330038;
3. 中南大学土木工程学院,湖南长沙 410075;
4. 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

基金项目: 国家自然科学基金项目（51768020,51568022）

详细信息

作者简介:
石钰锋(1985— ),男,副教授,主要从事隧道与地下工程方面的研究工作。E-mail: s074811156@126.com。

通讯作者:
徐长节，E-mail：xucj@zju.edu.cn

中图分类号: TU45
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出版历程
- 收稿日期: 2018-12-15
- 发布日期: 2019-11-24

Rock pressures of tunnels based on finite element upper bound analysis method with rigid moving elements

1. Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, Nanchang 330013, China;
2. Nanchang Rail Transit Group Co., Ltd., Nanchang 330038, China;
3. Civil Engineering School, Central South University, Changsha 410075, China;
4. Key Laboratory of Engineering Structure of Heavy Railway, Ministry of Education, Changsha 410075, China

摘要

摘要: 针对隧道围岩压力与破坏模式问题,应用刚体平动运动单元上限有限元方法（UBFEM-RTME）与程序开展计算分析,获得了支护反力系数N_γ及N_c上限解曲线图和围岩有效间断线网破坏模式及其演变规律。与多种基于假定破坏机构的刚性块体上限法及模型实验结果进行对比分析,验证了UBFEM-RTME方法获得的支护反力上限解为极限分析上限理论框架内的较优解答,并且N_γ及N_c上限解与太沙基围岩压力解答变化趋势基本一致。除N_γ及N_c上限解外,UBFEM-RTME方法获得的隧道围岩有效间断线网破坏模式存在多种形态特征,大致涵盖了既有文献关于围岩破坏机构假定的多种型式,体现出该方法能摆脱假定破坏机构的限制,应用于隧道围岩压力求解具有良好适用性。
- 围岩压力 /
- 支护反力系数 /
- 极限分析 /
- 上限有限元 /
- 刚体平动运动单元 /
- 破坏模式
Abstract: According to the determination of the rock pressures and collapse mechanisms of tunnels, the finite element upper-bound method with rigid translatory moving elements (UBFEM-RTME) is used to obtain the upper bound solution charts of the supporting force coefficients N_γ and N_c as well as collapse mechanisms with active discontinuities and evolution laws. Compared with a wide variety of the upper bound rigid block method (UBRB) assuming collapse mechanisms and the simulation model tests, it is verified that the upper limit solution of the support force obtained by the UBFEM-RTME method is the optimal solution in the theoretical framework of the upper bound limit analysis. At the same time, the upper bound solutions of N_γ and N_care consistent with the trend of the rock pressure solutions of the Terzaghi theory. In addition to the upper solutions of N_γand N_c, the UBFEM-RTME method has many morphological features in the collapse mechanisms with active discontinuities, and basically covers different types of failure mechanisms in the existing literatures. It is shown that the UBFEM-RTME method can get rid of the limitation of the assumed collapse mechanisms and has great applicability and superiority for solving the rock pressures of the tunnels.
- rock pressure /
- supporting force coefficient /
- limit analysis /
- upper bound finite element method /
- rigid translatory moving element /
- collapse mechanism

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