Influence of Underlying Qanat Tunnel on Stability of High-Speed Railway Subgrade

被引：1
|
作者：
Zhang Y. [1 ,2 ]
Liu X. [1 ,2 ,3 ]
Yuan S. [1 ,2 ]
Wang Y. [2 ]
Fu W. [2 ]
Zhao T. [2 ]
Chen W. [4 ]
机构：
[1] Key Laboratory of High-Speed Railway Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu
[2] School of Civil Engineering, Southwest Jiaotong University, Chengdu
[3] School of Civil Engineering, Xinjiang Institute of Engineering, Urumqi
[4] China Railway Eryuan Engineering Group Co., Ltd., Chengdu
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2021年 / 42卷 / 03期
关键词：
Critical depth; Finite element limit analysis; High-speed railway; Qanat; Stability; Subgrade; Underground channel;
D O I：
10.3969/j.issn.1001-4632.2021.03.02
中图分类号：
学科分类号：
摘要：
The finite element limit analysis method was used to simulate the stability of high-speed railway subgrade underlying qanat tunnel. Results show that, the failure modes of subgrade underlying qanat tunnel under subgrade load mainly include the failure in the upper soil of the underground channel and the sliding failure of subgrade slope. With the buried depth and horizontal position of the qanat tunnel away from the subgrade, the failure mode evolves gradually into the self-failure of subgrade slope. The critical depth distribution curve of the underground channel is in the shape of "W", which is mainly related to the location, shape and size of the qanat tunnel. When the location of the qanat tunnel is below the critical depth distribution curve, the ultimate bearing capacity of the foundation no longer changes with the location of the qanat tunnel, and the stability of the subgrade is no longer affected by the underground channel. The smoother the section shape of the channel is, the better the mechanical performance and stability of the subgrade are. The critical depth of the circular qanat tunnel is the smallest when the subgrade is stable. The larger the section width of qanat tunnel is, the worse is the stability of the subgrade. When the section size of the circular qanat tunnel is doubled, the critical depth of the qanat tunnel increases by about 10 times. © 2021, Editorial Department of China Railway Science. All right reserved.
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页码：13 / 20
页数：7
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