›› 2012, Vol. 33 ›› Issue (6): 1876-1882.

• Numerical Analysis • Previous Articles     Next Articles

Numerical calculation of time effect deformations of tunnel surrounding rock in terms of water degradation

HUANG Ming1, 2，LIU Xin-rong2，DENG Tao1   

  1. 1. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China; 2. College of Civil Engineering, Chongqing University, Chongqing 400045, China
  • Received:2011-12-29 Online:2012-06-11 Published:2012-06-14

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Abstract: Based on a visco-elastoplastic model considering the feature of water degradation effect of rock, its finite difference scheme is presented. Through program development for the model by C++ language, the FLAC3D dynamic link library file is obtained. To test the model effectiveness, it is shown that the model program can better simulate the instantaneous elastic deformation, attenuation creep, creep constant, water degradation and plastic deformation characteristics of rock. With the numerical calculation for an on-site tunnel geological model by the visco-elastoplastic model program, it is shown that the vault settlement, convergence and uplift deformation increase with the growth of moisture content, and the time that surrounding rock remains stable is shortened. Uplift displacement in saturated state is twice of that in natural moisture state; and the time that surrounding rock remains stable in saturated state is less than that in natural moisture state for about 40 days; so reasonable construction time for the second supporting is also greatly shortened. The calculation results are consistent with the measuring results in the tunnel site, which can explain the generation mechanism of large deformation disaster effectively. Both stability of rock-support system and reasonable time for the second supporting can be well predicted by the visco-elastoplastic model program presented above.

Key words: visco-elastoplastic model, program development, water degradation, numerical calculation

CLC Number: 

  • U 452.1+2
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