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Abstract Natural rock mass usually contains multiple parallel distribution of persistent crack sets. It is important to study the deformation and deformation characteristic of rock mass with parallel distribution of persistent crack in engineering design and stability analysis of surrounding rock mass. On the assumption that rock is isotropic linear elastic body and the stress-displacement relation of crack is linear stiffness relation，the computational model of deformation of rock mass with multiple persistent crack sets is presented by the method of Mohr?s circle of stress. On this basis，the rock mass with cracks are equivalent to anisotropic continuous mass. Equivalent elastic modulus and equivalent poisson?s ratio are put forward. The effect of material parameters and geometry parameters of rock and crack to the equivalent elastic modulus and equivalent poisson?s ratio of rock mass with cracks is studied. The model can comprehensively consider the effect of material parameters and geometry parameters of rock and crack to the deformation of rock mass. So the model has some reference value in predicting deformation and stability of rock mass.
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Received: 14 February 2011
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2011, Vol. 30 
