| Hydraulic behavior in fractured rock has an important effect on geotechnical engineering, such as water-grushing in excavation of underground chambers and tunnels, construction of dam foundation, exploitation of oil and terrestrial heat, burial of chemical material and nuclear waste, design on mine and so on. At present, cubic law based on parallel plate model has been accepted in geotechnical engineering field, and many scholars have done much research work to modify cubic law in aperture and roughness.Based on the results of previous studies concluded on the basis of the aquifer medium flow stress fracture coupled's basic theory. Including the structure of rock type, single fracture mechanics of the nature of deformation, stress-fracture flow coupling, and so on the basic principles And for fractured rock equivalent continuous media analysis of specific mathematical model, introduced a stress fracture aquifer medium flow coupled mathematical model of the basic method, to study the seepage field corresponding field and the effect of stress on the effect of seepage . Formula has been derived through seepage and stress coupled FEM control equation. In this process, details of the finite element method to solve the basic ideas and methods and finite element in the process of numerical simulation of nonlinear equations for the early traffic law.Based on the derivation of the fractured rock flow stress coupled FEM numerical simulation equation, Beijing Arrows developed using the finite element automatically generated procedures FEPG(Finite Element Program Generator) to simulate the fractured rock flow problems. Through the software to prepare a calculation of displacement, pore water pressure and stress of pde document describing the load border fbc documents and papers and coupling system algorithms generate displacement, flow rate unit algorithm document nfe. These documents are finite element analysis process, finite element analysis procedures applied to these examples drawn the following conclusions:(1) With the stress fractured rock permeability changes can not be ignored. In the fractured rock, the stress of the moment changes affecting the flow channel open and closed, the permeability of the great impact.(2) With time step, the continuous load of the regional impact of stress seepage field, coupling appear, reduce the intensity of seepage. Not load the regional stress intensity change significantly, the role of groundwater seepage significant impact on the corresponding field.(3) Sustained by the load, the fractured rock in all directions on the displacement of little change, displacement do not changes with time. |
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