Journal
COMPUTERS AND GEOTECHNICS
Volume 107, Issue -, Pages 110-127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compgeo.2018.11.025
Keywords
Slip line; Limit analysis; Face stability; Collapse mechanism; Purely cohesive soils
Categories
Funding
- National Natural Science Foundation of China [41572275]
- Natural Science Foundation of Shandong Province [ZR2012EEM006]
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Based on the slip line and limit analysis theories, this paper presents a new 3D collapse mechanism to analyze the face stability of a circular shield-driven tunnel in purely cohesive soil. The new collapse mechanism is a 4 variable multizone mechanism that depends on cover-to-diameter ratios (C/D). The proposed mechanism suggests that failure zones at the tunnel face are primarily formed by shear failure. A comparison of this approach with numerical methods and other kinematic approaches shows that the proposed failure mechanism significantly improves the existing upper-bound solutions for the face stability of circular tunnels in purely cohesive
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