Based on the cubic law of flow in single fissure with unmiform openings and the fundamental equations of fluid mechanics,the seepage model of single fissure with variable openings is analyzed,the formula of the equivalent aperture of fractures with vdriabe openings is deduced by means of the principle of the same flow rate.
Firstly, demonstrating the original constant element (flat board element) displacement discontinuity method to resolve stress intensity factors and stress field nearby crack tip is inefficient, its arises from the geometrical shape of element is inconsistent with geometrical shape of crack tip, and so on. Use for reference crouch's means to amend two dimensional crack tip, bring forward three dimensional parabolic crack tip element to improve original flat element.
By the Fourier transformation method, the elastic solutions of displacement discontinuity in infinite plane have been derived in this paper and one set of linear algebraic equations for solving the value of discontinuous displacement on the crack surface has been established according to stress or displacement boundary conditions.
3. The method for calculating equivalent permeability tensor is introduced , and the determinant criterions for the tensor validity are presented to assure the validity of fractured network equaling to equivalent continuum medium.
4. On the base of the two methods for obtaining permeability parameter of fractured rock, aiming at the limitation of corrected formula, corrected formula of integration permeability coefficient is put forward through numerical simulation of two-dimension packer permeability test. The corrected result shows the seepage characteristic of fractured rock anisotropy.
In the paper, the significance and the present states of the research on the coupled relationship between the vadose field and the deformation field in fractured rock mass is analysed. The stress coupling model of the two phase media (Solid liquid) of fractured rock mass is built. Besides,the attitude of the fractures in the model may use the surveysed data directly by a certain transformation relationship which we gave in the paper.