Tunnel Face Stability and Collapse Shape in Upper-Soft and Lower-Hard Strata

被引：1
|
作者：
An Y. [1 ,2 ]
Li J. [2 ]
Cao Q. [3 ]
Yue J. [2 ]
Ouyang P. [2 ]
机构：
[1] Hunan Provincial Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan, 411201, Hunan
[2] School of Civil Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan
[3] Changsha Metro Group Co., Ltd., Changsha, 410000, Hunan
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2019年 / 40卷 / 01期
关键词：
Collapse shape; Stability of tunnel face; Strength reduction method; Tunnel engineering; Upper-soft and lower-hard strata;
D O I：
10.3969/j.issn.1001-4632.2019.01.11
中图分类号：
学科分类号：
摘要：
In order to analyze the influence of the upper-soft and lower-hard strata on the stability of the tunnel constructed by the New Austrian Tunneling Method, the dimensionless parameter of the relative thickness coefficient of the weak strata at tunnel face was defined. By means of finite element simulation combined with strength reduction method, the tunnel face stability and collapse shapes under different relative thickness coefficients were studied. Results show that, if the boundary between soft and hard strata is in tunnel face, the greater the thickness coefficient of weak strata is, the smaller the stability is. With the increase of the relative thickness coefficient of weak strata, the area of collapse in front of tunnel face is enlarged and the maximum displacement is below the center of the weak strata of tunnel face. The range of stress arch is expanding, and the force transferred to the lower part of tunnel face is greater. Therefore, more attention should be paid to reinforcing the lower part of tunnel face. There is an optimal path for the joint effect of cohesion and internal friction angle on the tunnel face stability, and the reinforcement effect along this path is the most effective. Tunnel face stability decreases with the increase of soil weight, excavation height and the thickness of weak strata. There is an extreme value for the effect of thickness-span ratio on the stability of tunnel face, which can be used as one of the reference conditions for determining the reasonable buried depth of tunnel. Surface surcharge affects the stability of tunnel face only when it is shallow buried. © 2019, Editorial Department of China Railway Science. All right reserved.
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页码：79 / 87
页数：8
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