Failure laws of asymmetrical double-arch tunnels under effects of voids behind vault

被引：0
|
作者：
Min B. [1 ,2 ]
Zhang C. [1 ,2 ]
Zhang X. [1 ,2 ]
Gong Y. [1 ,2 ]
Yuan T. [1 ,2 ]
机构：
[1] Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing
[2] School of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2019年 / 50卷 / 07期
基金：
中央高校基本科研业务费专项资金资助;
关键词：
Asymmetrical double-arch; Lining cracks; Model tests; Numerical simulation; Surrounding rock pressure; Voids behind vault lining;
D O I：
10.11817/j.issn.1672-7207.2019.07.023
中图分类号：
学科分类号：
摘要：
Numerical simulations and model tests were carried out to study the influence of voids behind the vault of asymmetrical double-arch tunnel on failure processes. The results show that: 1) The bottom of the middle wall is the weak position of the asymmetrical double-arch tunnels, no matter whether the voids exist, the outer side of the bottom of the middle wall first cracks. 2) The voids behind the vault lead to more complicated structural cracking. Multiple lining cracks are observed near the voids and are distributed asymmetrically. The failure of the tunnel on the other side is aggravated, especially at the crown and the connection between vault and middle wall. 3) The voids behind the large-diameter tunnel have a great impact on the structure destruction of both tunnels, while the voids behind the small-diameter tunnel have less impact on the damage of the tunnel on the other side. 4) The larger the void is, the greater effects and more severe cracks the voids lead to. 5) The voids change the form of pressure distribution on the surface of lining and lead to stress concentration in the area near the vault, which is related to the cracks of lining. © 2019, Central South University Press. All right reserved.
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页码：1686 / 1695
页数：9
相关论文
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