| 软岩小净距隧道最优开挖方法数值模拟 |
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| 引用本文： | 杨进京,李德武.软岩小净距隧道最优开挖方法数值模拟[J].兰州铁道学院学报,2014(6):92-97. |
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| 作者姓名： | 杨进京 李德武 |
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| 作者单位： | 兰州交通大学 土木工程学院,甘肃 兰州,730070 |
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| 基金项目： | 中国铁路总公司科技研究开发计划，铁道部科技研究开发计划 |
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| 摘 要： | 以兰渝线新城子隧道为背景,利用有限元法模拟并分析了不同开挖方法对软岩小净距隧道的相互影响,以及双层支护结构在小净距隧道中的应用效果.结果表明,双层支护可以有效的控制地应力的分阶段释放;第一层初支承担大部分围岩荷载,第二层初支承担第一层初支变形引起的荷载;通过对比分析发现,两隧道交互开挖、待左右线均开挖完成后再施作二衬为最优工法.
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| 关 键 词： | 软岩 小净距隧道 双层支护 数值模拟 |
Numerical Simulation of Optimal Excavation Method of Close-spaced Soft Rock Tunnel |
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| YANG Jin-jing,LI De-wu.Numerical Simulation of Optimal Excavation Method of Close-spaced Soft Rock Tunnel[J].Journal of Lanzhou Railway University,2014(6):92-97. |
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| Authors: | YANG Jin-jing LI De-wu |
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| Institution: | (School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070,China) |
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| Abstract: | Based on the background of Xinchengzi Tunnel on Lanzhou-Chongqing line,the finite element method is used to simulate and analyze different excavation methods for close-spaced soft rock tunnel.The results show that it is prone to large deformation and stress in the sidewall of the adjacent side when close-spaced tunnels are constructed at the same time.Most of the loads are undertook by the first layer support,and the deformation of first layer support is undertook by the second layer support.Meanwhile,by comparative analysis,it is found that constructing the secondary lining after the completion of excavating the right and left lines is the best engineering method when two tunnels are excavated interactively.The analysis result provides the closespaced soft rock tunnel construction with referential basis. |
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| Keywords: | soft rock close-spaced tunnel double-layer support numerical simulation |
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