| 基于非线性破坏准则的隧道顶板稳定性分析 |
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| 引用本文： | 钟正强,彭振斌,彭文祥.基于非线性破坏准则的隧道顶板稳定性分析[J].科技导报(北京),2009,27(7). |
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| 作者姓名： | 钟正强 彭振斌 彭文祥 |
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| 作者单位： | 钟正强,ZHONG Zhengqiang(中南大学地学与环境工程学院,长沙410083;长沙理工大学土木与建筑学院,长沙410114);彭振斌,彭文祥,PENG Zhenbin,PENG Wenxiang(中南大学地学与环境工程学院,长沙,410083)
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| 摘 要： | 利用数值方法建立了隧道计算模型,采用Hoek-Brown准则描述隧道围岩破坏情况,通过厚度折减法,分析了Hoek-Brown准则情况下,隧道开挖的顶板稳定性.得出结论:①随着隧道跨度的增大,安全顶板厚度也逐渐增大,二者关系符合线性特征;②隧道围岩开挖后,大部分处于受压状态,仅在隧道正上方局部位置存在拉应力区域:随着隧道跨度的增大,顶部围岩所承受的拉应力逐渐增大;③跨度较小时.隧道顶板和边墙主要发生剪切破坏,破坏范围呈现以隧道为中心向外扩散的翼型形状;随着跨度的增大,此范围出现部分拉剪破坏区域.
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| 关 键 词： | 隧道 非线性破坏准则 顶板 稳定性 |
Stability Analysis for Tunnel Roof Based on Nonlinear Failure Criterion |
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| ZHONG Zhengqiang,PENG Zhenbin,PENG Wenxiang .School of Geoscience , Environment Engineering,Central South University,Changsha ,China .School of Civil Engineering , Architecture,Changsha University of Science , Technology,Changsha ,China.Stability Analysis for Tunnel Roof Based on Nonlinear Failure Criterion[J].Science & Technology Review,2009,27(7). |
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| Authors: | ZHONG Zhengqiang PENG Zhenbin PENG Wenxiang School of Geoscience Environment Engineering Central South University Changsha China School of Civil Engineering Architecture Changsha University of Science Technology Changsha China |
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| Institution: | ZHONG Zhengqiang1,2,PENG Zhenbin1,PENG Wenxiang1 1.School of Geoscience , Environment Engineering,Central South University,Changsha 410083,China 2.School of Civil Engineering , Architecture,Changsha University of Science , Technology,Changsha 410114,China |
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| Abstract: | A numerical calculation model for excavation of tunnel is built by numerical method,the Hoek-Brown criterion is applied to describe the condition of failure in the surrounding rock mass;then,with the thickness reduction method,the safe thickness of the roof after excavation in tunnel is obtained with the Hoek-Brown criterion.The results show that,(1)with the increase of the span of tunnel,the safe roof thickness increases gradually,in a linear manner;(2)when tunnel is excavated,the stress in the surrounding... |
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| Keywords: | tunnel nonlinear failure criterion roof stability |
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