Experimental and analytical study of shield tunnel face in dense sand strata considering different longitudinal inclination

2021 ◽  
Vol 113 ◽  
pp. 103950
Author(s):  
Cheng Cheng ◽  
Pengjiao Jia ◽  
Wen Zhao ◽  
Pengpeng Ni ◽  
Qian Bai ◽  
...  
Keyword(s):  
Analytical Study ◽  
Shield Tunnel ◽  
Tunnel Face ◽  
Dense Sand ◽  
Shield Tunnel Face

Study on the Stability of Large Cross-River Shield Tunnel Face with Seepage

2013 ◽  
Vol 405-408 ◽  
pp. 1371-1374 ◽  
Author(s):  
Xi Lin Lu ◽  
Feng Di Li
Keyword(s):  
Numerical Analysis ◽  
Water Level ◽  
Coupling Effect ◽  
Shield Tunnel ◽  
Support Pressure ◽  
Seepage Force ◽  
Tunnel Face ◽  
Increasing Trend ◽  
The Stability ◽  
Shield Tunnel Face

By 3D numerical analysis, the seepage force on the tunnel face was obtained and shows linearly increasing trend with the water level. By considering the average seepage force on the wedge boundary of 3D trapezoidal wedge model, the limit support pressure to keep stability of tunnel face under seepage condition was obtained. The total limit support pressure increases almost linearly with the water level. In order to consider the deformation seepage coupling effect, the 3D coupled deformation and seepage numerical analysis was further used to investigate the influence of the water level on the failure of tunnel face, the results show the failure mode changes with the increase of water level, and the limit support pressure increases nonlinearly with the water level.

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