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159053 Table 7. Major hydraulic conductivities of a cubic block of rock mass under isotropic compression and increasing shear loading With the increase of shear load from 4 to 20 MPa, the change in the major hydraulic conductivity vertical to the direction of shear load, kz, is even more interesting. Before the shear load reaches 10 MPa, kz decreases significantly with increasing shear load and manifests a shear contraction-like behavior. When the shear load further increases, shear dilatancy occurs and kz increases drastically, with changes in as high as 4-5 orders of magnitude.

25, the Lame’s constant is derived with λ=2 MPa. 4363 and s=σn/20. z z y x y x (a) (b) Fig. 16. A three dimensional fracture network with size of 20×20×20 m generated by using the Monte-Carlo method for the rock mass in the Laxiwa Hydropower Project: (a) fracture network and (b) traces of the fractures on the surfaces of the simulated area Stress/Strain-Dependent Properties of Hydraulic Conductivity for Fractured Rocks 29 The predicted hydraulic conductivity tensor for the examined rock mass is listed in Table 4.

From Table 7 and Fig. 23, we can further see that kx and ky are very close to each other in values and they generally have the same varying trend with the increasing shear load. 159053 Table 7. Major hydraulic conductivities of a cubic block of rock mass under isotropic compression and increasing shear loading With the increase of shear load from 4 to 20 MPa, the change in the major hydraulic conductivity vertical to the direction of shear load, kz, is even more interesting. Before the shear load reaches 10 MPa, kz decreases significantly with increasing shear load and manifests a shear contraction-like behavior.

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