Modification and application for ground pressure calculation model in shallow tunnels

被引：0
|
作者：
Lu Q. [1 ]
Guan Z. [1 ]
Zheng L. [1 ]
Jiang Y. [2 ]
机构：
[1] College of Civil Engineering, Fuzhou University, Fuzhou
[2] Department of Civil Engineering, Nagasaki University, Nagasaki
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2022年 / 53卷 / 11期
基金：
中国国家自然科学基金;
关键词：
ground pressure; horizontal slice method; modified calculation model; shallow tunnel;
D O I：
10.11817/j.issn.1672-7207.2022.11.025
中图分类号：
O1 [数学];
学科分类号：
0701 ; 070101 ;
摘要：
Based on the calculation diagram specified by the current codes, the slip angle was introduced and the modified calculation model was proposed, in which the potential slip plane deflects along with the change of parameters. The surface boundary condition was considered by using the horizontal slice method, so that the slip angle, the fracture angle, the lateral resistance and the vertical ground pressure were calculated in a more accurate way by graphical method. The case with different ground conditions was studied. Furthermore, the influences of anti-shear indices on the block volume, the lateral resistance and its distribution pattern, and the vertical ground pressure were discussed through sensitivity analysis. The results show that the calculation results from traditional model and modified model fit each other well. The modified model can be degenerated into the traditional model on the same calculation assumptions. The ground stability is enhanced with the increase of cohesion and friction angle, which reduces the volume of triangle block and the lateral resistance. Meanwhile, the influence of gravity on the distribution pattern of lateral resistance is weakened, and the influence of anti-shear indices is relatively enhanced, which makes the centroid of distribution curve move up. Therefore, the synergistic effect provided by the decreased lateral resistance and the increased volume of trapezoidal block enhances the vertical ground pressure. Cohesion and friction angle affect the calculation of ground pressure in an identical mechanism, so that the equivalent friction angle can also be adopted to calculate the ground pressure of shallow tunnel. © 2022 Central South University of Technology. All rights reserved.
引用
收藏
页码：4463 / 4472
页数：9
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