Abstract:In the course of excavating permanent shiplock slopes of the Three Gorges Project(TGP),the rock mass stress in the slopes area adjusted along complex paths. Aiming at the deformation properties of the rock mass in that state,in-situ real triaxial tests are carried out on rock mass with complex loading paths. Simulating the initial stress field and its variation patterns,the experimental load is applied under the following three loading paths:(1) s1 decreases,s2 and s3 maintain constant in the same course;(2) s1 increases,s2 maintains constant and s3 decreases in the same course;(3) s1 decreases,s2 maintains constant and s3 increases in the same course. Based on the testing data,the relationships between the elastic modulus and the principal stress difference under such loading paths are acquired,and the deformation properties of the slope rock mass are analyzed. The result indicates that,when a principal stress decreases and another one increases in the same process,the deformation is nonlinear and anisotropic. The elastic modulus keeps approximately invariable in the loading direction and speed-up decreasing in the unloading direction in accordance with the decreasing of the effective principal stresses.