INVESTIGATION ON MECHANICAL PARAMETERS OF WATER-ROCK INTERACTION
LU Yingfa1，2，SUN Hui2，LI Jianlin1，WU Xinxing1
(1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. School of Civil and Architectural Engineering，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：The processes are very complex for the coupling of water-rock interaction，and the sensitivity of water to porous media material cracks should be focused for the research of fundamental mechanical properties of rocks. The conventional used test methods are true and pseudo triaxial tests；and the theories and measure technologies of ture and pseudo triaxial tests are also analyzed. The mechanical parameters are obtained by ture and pseudo triaxial tests with/without water pressures. The idea that the triaxial test is only suitable for the isotropic porous media materials is proposed；and the hexahedron sample of 5 cm×5 cm×10 cm is proposed to conduct the triaxial test to understand the anisotropic mechanical behaviors of porous media materials. The obtained testing methods of anisotropic Biot coefficient and mechanical parameters under different stress states are proposed by using the influences of unloading water pressure on porous media materials. The testing results show that variational trends of anisotropic Biot coefficient in the different directions are not the same. The testing method of limit yield stress is suggested：the limit yield stress is equal to the deviatoric stress corresponding to the maximum water pressure of curve between deviatoric stress and water pressure. The testing results also show the Skempton coefficient disperity is significant；and the mechanism of water pressure action is different under various injections and drainages. It is crucial for damage mechanics and civil engineering to research water-rock interaction.
