Study on Face Stability of Shield Tunnel in Sandy Cobble Stratum

被引：0
|
作者：
Wang L. [1 ,2 ]
Hu R. [1 ,2 ]
Ren C. [3 ]
Zhang C. [3 ]
Zhang J. [3 ]
Jiang Y. [3 ]
Liu C. [3 ]
机构：
[1] China Railway First Survey and Design Institute Group Co., Ltd., Xi’an
[2] Key Laboratory of Shaanxi Railway and Underground Traffic Engineering, Xi’an
[3] School of Highway, Chang’an University, Xi’an
来源：
Tongji Daxue Xuebao/Journal of Tongji University | 2023年 / 51卷 / 09期
关键词：
limit equilibrium method; sandy cobble ground; shield tunnel; theoretical analysis; tunnel face stability;
D O I：
10.11908/j.issn.0253-374x.23219
中图分类号：
学科分类号：
摘要：
When the shield tunnel passes through the sandy cobble stratum, it is easy for the tunnel face to lose stability and cause accidents due to the stratum characteristics and construction disturbance of sandy pebble. In order to study the minimum supporting force required for the stability of the shield tunnel face in sandy cobble stratum, in combination with the instability mode of the tunnel face in sandy cobble stratum, and based on the three-dimensional Murayama model, the sliding surface of the soil in front of the tunnel face is assumed to be a logarithmic spiral slip line. In combination with the failure mechanism of the upper loose area, the ellipsoid drawing theory is introduced to improve the traditional prism silo model, and the limit support of the tunnel face in sandy cobble stratum is further derived by using the limit equilibrium method. Finally, the formula is verified by discrete element numerical simulation, and the error between the two is 3.1 %. The results show that the formula can accurately solve the limit support force of the tunnel face in sandy cobble stratum. The research results are expected to provide new ideas for the calculation of limit supporting force of tunnel face in sandy cobble stratum. © 2023 Science Press. All rights reserved.
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页码：1362 / 1371
页数：9
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