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Volume 37 Issue 4
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SONG Chun-xia, HUANG Mao-song, ZHOU Wei-xiang. Three-dimensional face stability analysis of tunnels in cohesive soils by upper bound limit method[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 650-658. DOI: 10.11779/CJGE201504010
Citation: SONG Chun-xia, HUANG Mao-song, ZHOU Wei-xiang. Three-dimensional face stability analysis of tunnels in cohesive soils by upper bound limit method[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 650-658. DOI: 10.11779/CJGE201504010
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Three-dimensional face stability analysis of tunnels in cohesive soils by upper bound limit method

  • 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Institute of Architecture and Engineering, Ningbo University of Technology, Ningbo 315016, China; 3. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 4. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200000, China

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  • Received Date: July 20, 2014
  • Published Date: May 05, 2015
    Graphical Abstract
    • Abstract
  • The three-dimensional failure mechanism for the face stability of tunnel in pure clay under undrained condition is improved. As in the existing 3D translational multi-block collapse mechanism, the intersection of the circular truncated cylinder with the tunnel face is an ellipse surface that does not cover the entire circular face of the tunnel. The truncated elliptical cylinder is adapted to construct the 3D translational multi-block failure mechanism. In the present 3D mechanism, all the radial cross-sections of the rigid block are elliptical, and the intersection of the cylinder with the tunnel face is a circular face. The 3D collapse mechanism is further modified to intermix rotating multi-block and homogeneous shear zone, and the corresponding upper bound solution significantly improves the existing limit analysis. The validity of the combined upper bound solution for the tunnel stability in clays is demonstrated by comparing with the existing 3D finite element and centrifuge results.
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    • References (23)
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