| Distribution and coupling condition of seepage fields and stress fields are important influenctial factors in fractured rock slope stability. According to the theories of rock mechanics,fracture mechanics,damage mechanics and seepage mechanics, based on the analysis of the process of unloading rock mass,analysis of theory,indoor experimentation and numerical calculation, the coupling mechanism of the seepage field and stress field for fracture rock masses are discussed, and the influence of seepage to rock slope's stability are discussed. The research work involves several aspects as follows: 1) The geometrical properties and structural characteristics of fractures in rock mass are introduced and researched,, which provides a sound basis for analyzing the permeability, fracture-damage, and seepage-stress coupling of fractured rock mass. 2) Based on the theories of fracture mechanics and damage mechanics, the process of unloading, the effects of water on fracture rock strength and unloading on fracture propagation are analysed. The relationship of the permeability coefficient and the unloading deformation of the rock mass has been studied. The coupling equation between the permeability coefficient of fracture rock masses and stress strength is set up in the paper. 3) According the experimental result, the equation of the seepage—stress of unloading is established ,the variational rule of the unloading rock and modulus of seepage is discussed. 4) The rule of stress redistribute on the rock slope which unloading on the rock slope stability arosed is investigated and analysed. Based on the theories of fracture mechanics, the instable and expanding mechanism of unloading are discussed. The rock slope stability is analysed by the Lagrangian element method , the safety factor is gained by the different permeability coefficient.
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