| 既有隧道扩建工程及衬砌稳定性研究 |
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| 引用本文： | 杨小礼,王作伟,陈杰.既有隧道扩建工程及衬砌稳定性研究[J].长沙交通学院学报,2010,26(1):49-52,58. |
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| 作者姓名： | 杨小礼 王作伟 陈杰 |
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| 作者单位： | 1. 中南大学,土木建筑学院,湖南,长沙,410075
2. 福建省林业勘察设计院,交通分院,福建,福州,355000 |
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| 摘 要： | 以当风凹隧道为工程研究背景，采用二维弹塑性有限差分分析方法，研究既有隧道扩建过程中的力学特征及其支护强度；分析并得出既有隧道扩挖与假设新建一座隧道在力学上的主要差异：采用同种施工方法时，因为已有衬砌的作用，在旧洞基础上扩挖将避免对围岩的大面积扰动，且能充分发挥围岩承载力；结合公路隧道设计规范给定的极限状态方程，计算出隧道衬砌的强度安全系数；从位移、应力和安全系数等方面分析并证明了隧道的稳定性，研究成果为类似的隧道设计施工提供参考．
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| 关 键 词： | 隧道扩建 有限差分法 数值模拟 强度安全系数 |
Extension engineering of tunnel and stability analysis of lining structures |
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| YANG Xiao-li,WANG Zuo-wei,CHEN Jie.Extension engineering of tunnel and stability analysis of lining structures[J].Journal of Changsha Communications University,2010,26(1):49-52,58. |
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| Authors: | YANG Xiao-li WANG Zuo-wei CHEN Jie |
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| Institution: | 1. School of Civil and Architectural Engineering, Central South University, Changsha 410075, China; 2. The Survey and Design Institute for Forestry of Fujian Province, Fuzhou 355000, China) |
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| Abstract: | By using the 2D finite difference method of elastic-plasticity, the simulation of extension of Dang Feng Ao tunnel was carried out. Through comparing the method of excavating a new tunnel, which has the same contour of widened Dang Feng Ao, some difference has been found as followings： with the same construction method, wide-area disturbances of rock can be avoided, and the bearing capacity can be fully used in the case of extension. With the limit state equation given by the code for design of road tunnel, safety coefficients of the lining structure were calculated. Then the analysis of structure security was described from three aspects as displacement, strain and safety coefficients, with offersas a guidance and a reference for the design and construction of similar road tunnel. |
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| Keywords: | extension engineering finite difference method numerical simulation safety coefficient |
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