›› 2009, Vol. 30 ›› Issue (6): 1705-1710.

• Geotechnical Engineering • Previous Articles     Next Articles

Damage analysis and optimum research on construction process for forked tunnel under bias pressure

WANG Han-peng1，LI Shu-cai1，ZHENG Xue-fen2   

  1. 1. Research Center of Geotechnical and Structural Engineering, Shandong University, Ji’nan 250061, China; 2. Shandong Urban Construction Vocational College, Ji’nan 250014 China
  • Received:2007-10-08 Online:2009-06-10 Published:2011-03-09

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Abstract:

Baziling forked tunnel along Shanghai-Chengdu Expressway in construction is an unsymmetrically loaded tunnel. Construction process of forked tunnel is very complex because the forked tunnel includes twin-bore section and small clear spacing section. So, it’s important for forked tunnel to adopt appropriate construction process. In order to simulate rock mass properties veritably and analyze damage failure of rock in construction, the coupling model of elastoplastic damage is presented based on irreversible thermodynamics theory. 3D elastoplastic damage finite element code D-FEM is programmed by FORTRAN language. A large 3D numerical model of forked tunnel is set up and different construction processes are simulated by D-FEM. Through analyzing displacement, stress and damage yield zone of tunnel surrounding, the optimum construction process that left tunnel excavates ahead of right tunnel 32 m is determined, left tunnel and right tunnel excavate synchronously is proposed.

Key words: bias pressure, forked tunnel, construction process optimization, elastoplastic damage, finite elements

CLC Number: 

  • U 457
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