基坑开挖对既有隧道的影响与支护方案对比研究-《高速铁路技术》

文章信息/Info

Title:: Comparative Study on Impact of Foundation Pit Excavation and Supporting Schemes on Existing Tunnels

作者:: 张昊然; 姚海波; 耿英宸; 李嘉兴; 王增月; 1. 北方工业大学, 北京 100144;
2. 中化学路桥建设有限公司, 北京 101100

Author(s):: ZHANG Haoran; YAO Haibo; GENG Yingchen; LI Jiaxing; WANG Zengyue; 1. North China University of Technology, Beijing 100144, China;(;
2. China Chemical Engineering Road Bridge Construction Corporation Ltd., Beijing 101100, China

Keywords:: foundation pit excavation|foundation pit support|railway tunnel|stress and displacement analysis

摘要:: 为研究基坑开挖时不同支护方案对既有铁路隧道的影响,本文通过MIDAS-GTS有限元软件进行分析建模,模拟在基坑开挖的过程中,地下连续墙支护方案与钻孔灌注桩支护方案下对既有铁路隧道的影响。计算结果表明,随着开挖的进行,地下连续墙方案中,隧道衬砌上的最大主应力值、最小主应力值和剪力值均小于钻孔灌注桩方案下的应力值;同时,地下连续墙支护方案中的隧道沉降量也明显小于钻孔灌注桩支护方案下的沉降量。可以得出结论,在基坑开挖过程中,地下连续墙支护方案更加稳定,要优于钻孔灌注桩支护方案。研究成果可为相似的工程施工提供参考。

Abstract:: In order to study the impact of different support schemes on existing railway tunnels during foundation pit excavation, this paper analyzes and models the impact of underground diaphragm wall and bored piles on existing railway tunnels with the finite element software MIDAS-GTS. The results show that with the excavation, the maximum principal stress, the minimum principal stress and the shear force on the tunnel lining in case of the underground diaphragm wall are less than those in case of bored piles. Moreover, the settlement of the tunnel in case of the underground diaphragm wall is obviously smaller than that in case of bored piles. It can be concluded that for foundation pit excavation, the underground diaphragm wall is more stable and superior to the bored piles. The conclusions may be used as reference for similar projects.