Limit Analysis of Face Stability of Special-shaped Shield Tunnels Considering Solid-fluid Coupling Effect

被引：0
|
作者：
Zhang C.-P. [1 ,2 ]
Shang Y.-F. [1 ,2 ]
Li W. [1 ,2 ]
Tu S.-Q. [1 ,2 ]
Ma M.-S. [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：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 11期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
face stability; fluid-solid coupling; limit analysis; special-shaped shield; tunnel engineering; upper bound theorem;
D O I：
10.19721/j.cnki.1001-7372.2023.11.015
中图分类号：
学科分类号：
摘要：
This study aimed to effectively evaluate the face stability of special-shaped shield tunnels in saturated soils, providing solutions for estimating and controlling these structures. An analytical method and numerical simulation were utilized to examine the progression of face failure in special-shaped shield tunnels situated in saturated soils under active failure conditions. Additionally, a strategy for determining the critical face pressure of tunnel faces was proposed. By using the finite difference software, FLAC3D, numerical models were established to illustrate the active failure of a special-shaped shield tunnel face, considering the fluid-solid coupling effect. The distribution of pore pressure in the vicinity of the special-shaped shield tunnel face was identified via FISH language programming. By leveraging space discretization technology and the upper bound theorem of limit analysis, a linear interpolation program was utilized to calculate the rate of seepage force of underground water. An analytical model considering the fluid-solid coupling effect was established to observe the active failure of a special-shaped shield tunnel face in saturated soils. This model shed light on the impacts of factors, such as face shape, soil parameters, and water level, on the critical face pressure and the 3D failure mode of the tunnel face. Findings reveal that the pore pressure of saturated soils under the fluid-solid coupling effect is significantly higher than that under pure fluid flow conditions. The gradient of the pore pressure distribution near the tunnel face is much greater than in other zones. Additionally, it is determined that the critical face pressures of the rectangular and five-centered horseshoe-shaped tunnels are higher than those of the oval and three-centered horseshoe-shaped tunnels under similar conditions. © 2023 Xi'an Highway University. All rights reserved.
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页码：345 / 357
页数：12
相关论文
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