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Abstract Based on triaxial hydro-mechanical compressive tests and triaxial creep tests of the strongly weathered granite，a constitutive model with Mohr-Coulomb yield criterion is established to describe the elastoplastic hardening and plastic flow behavior of the weathered granite. Parameters of the mechanical model are obtained from back analysis combining Nelder-Mead algorithm and finite element method. A nonlinear creep model is established by using triaxial creep tests and relative creep parameters are obtained. On the basis，the model is imbedded into ABAQUS by writing creep subprogram. The models and parameters derived from laboratory tests are justified through field inversion analysis. Based on the developed models and the obtained parameters，long-term stability of tunnel located in F4 is studied. The numerical simulation results provide some reasonable suggestions for tunnel design and long-term operation management.
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Received: 19 May 2010
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2010, Vol. 29 
