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Volume 35 Issue 10
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LI Xiu-di, zheng Ying-ren, YUAN Yong, shi shao-qing. Strength reduction method for submarine immersed tunnels[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 1876-1882.
Citation: LI Xiu-di, zheng Ying-ren, YUAN Yong, shi shao-qing. Strength reduction method for submarine immersed tunnels[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(10): 1876-1882.
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Strength reduction method for submarine immersed tunnels

  • 1. Department of Architectural and Civil Engineering, Logistical Engineering University, Chongqing 401311, China; 2. Chongqing Engineering and Technology Research Center of Geological Hazard Prevention and Treatment, Chongqing 400041, China; 3. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

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  • Received Date: January 04, 2013
  • Published Date: October 19, 2013
    Graphical Abstract
    • Abstract
  • The strength reduction method is proposed to study the safety and stability of a submarine immersed tunnel made of reinforced concrete under static loading. Firstly, based on the strain compatibility principle considering the distribution and mechanical characteristics of reinforcing bars, formulas for calculating the shear strength and the tensile strength of the equivalent model of reinforced concrete structures are derived. Secondly, a non-linear numerical model for the strength reduction method considering structure-soil-seawater interaction is established by means of FLAC3D software to simulate the failure of the immersed tunnel. The simulated results show that a sudden change of displacement can not be used as one of failure criterions for the immersed tunnel. The safety factor of the immersed tunnel is obtained considering the plastic state, shear strain increment and relationship between the tunnel roof displacements and the reduction factors. By using the strength reduction method, the failure mechanism of the immersed tunnel is revealed. Failure modes of the immersed tunnel section are mainly the shear failure and the tensile failure distributed near the center of the tunnel roof slab and the intersection between the roof slab and the two lateral walls.
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    • References (16)
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