Determination of permeability tensor of fractured rock in upper reservoir of pushihe pumped-storage power station

A method for determination of permeability tensor of fractured rock was presented,which not only can reflect the permeability characteristic of fractured rock,but also is relative accurate.First based on the measurement of spatial spread status of fractures,the permeability tensor of fractured rock was determined preliminarily using statistics method,the principle values and directions of which were obtained,then according to the permeability rate of rock from field water pressure test,the hydraulic conductivity of rock was calculated with Babushijin formula,and the correction coefficient was computed,thus the modified permeability tensor of fractured rock in the research area was obtained.Besides,the permeability tensor of fractured rock in dam site of upper reservoir of Pushihe pumped-storage power station was calculated with above method.The result shows that the method can better depict the anisotropic character of the permeability of fractured rock,and can provide scientific basis for the permeability zoning of rock and optimization of impervious curtain.