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Abstract The common character of layered rocks is transversely isotropic due to the existence of regular bedding planes，which means that the failure mechanism and deformation characteristics of such rocks have the obvious difference with common rocks. In view of this point，a strain hardening-softening composite model of layered rock mass is proposed according to the physico-mechanical characteristics of structural plane and rock matrix，and it can be used to describe the anisotropic characteristics of rock strength and deformation，as well as progressive failure or sliding characteristics. Then，the proposed model has been successfully established and embedded on the basis of the third developing platform of constitutive model in FLAC3D，realizating nonlinear numerical calculation. The results including the comparison with classical theoretical solutions and numerical solutions，simulation of uniaxial and triaxial compressions of layered rock mass and so on prove that the proposed model is suitable for the description of the above characteristics. At the same time，the mechanical response characteristics and progressive failure processes of test blocks with different confined pressures and different dip angles are analyzed；and the failure or sliding mechanism of such rocks is discussed so as to better understand the mechanical properties. Finally，the proposed model is used to simulate a typical slope project and a cavern project；and the simulation results can be used to better explain in-situ deformation and failure phenomenon，and they are in accordance with engineering practice. It is shown that the proposed model is correct and feasible for the engineering application.
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Received: 30 September 2009
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