隧道安全系数  ,弹性模量  ,参数折减法  ,极限位移  ,围岩级别," /> 考虑围岩弹性模量劣化隧道稳定性分析方法探讨 [an error occurred while processing this directive]
 
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现代隧道技术 2013, Vol. 50 Issue (6) :72-79    DOI:
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考虑围岩弹性模量劣化隧道稳定性分析方法探讨
(1西安理工大学水利水电学院，西安 710048； 2西北电力设计院电网分公司，西安 710075)
Discussion of an Analytical Method for Evaluating Tunnel Stability Based on the Elastic Modulus Degradation of Surrounding Rocks
(1 Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048;
2 Grid Design Branch, Northwest Electric Power Design Institute, Xi'an 710075)
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摘要     文章采用从围岩变形角度定义的隧道安全系数，并通过增大围岩实际位移（因隧道开挖）至极限位移（围岩处于临界破坏状态）来定量评价隧道稳定性。首先基于无衬砌圆形隧道的弹塑性理论分析，推导出了通过考虑围岩弹性模量劣化来实现增大实际位移的参数折减法原理，并以极限位移作为隧道失稳破坏判据计算隧道安全系数；然后应用有限元参数折减法探讨了不同埋深和洞径下无衬砌圆形隧道处于多种围岩级别的稳定性程度。研究表明，参数折减法的可行性和适用性在I~IV级围岩中得到了较好的验证，而在V级围岩中存在一定偏差。
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关键词：  隧道安全系数  ')" href="#"> 隧道安全系数     弹性模量  ')" href="#">弹性模量     参数折减法  ')" href="#">参数折减法     极限位移  ')" href="#">极限位移     围岩级别')" href="#">围岩级别     
Abstract： This paper quantitatively evaluates tunnel stability using a safety factor defined in light of rock deformation and discusses the degree of stability by increasing the actual rock displacement caused by tunnel excavation to the ultimate displacement at the critical state. Based on the theoretical elasto-plastic analysis of an unlined circular tunnel, it derives a principle parameter reduction method in which the increase of actual displacement is achieved by considering the elastic modulus degradation of the surrounding rock. The safetyfactor is calculated by using the ultimate displacement as the criterion of tunnel instability. With the finite-element parameter reduction method, the stability of unlined circular tunnels with different depths and diameters in various grades of rock is discussed. The results show that the parameter reduction method is feasible and applicable to rock masses of grades I to IV, whereas there are some deviations for the rock mass of grade V.
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出版日期: 2013-05-16
基金资助:
 水利部公益性行业科研专项（201201053-03） 陕西省黄土力学与工程重点实验室重点科研计划项目（09JS103）
作者简介: 作者简介： 黄 俊(1984-)，男，博士研究生，主要方向为岩土隧道稳定性研究，E-mail:305huangjun@gmail.com.
引用本文:   
.考虑围岩弹性模量劣化隧道稳定性分析方法探讨[J]  现代隧道技术, 2013,V50(6): 72-79
.Discussion of an Analytical Method for Evaluating Tunnel Stability Based on the Elastic Modulus Degradation of Surrounding Rocks[J]  MODERN TUNNELLING TECHNOLOGY, 2013,V50(6): 72-79
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