Abstract:In this paper,structural effects of rock mass creep are studied by using numerical test. A series of uniaxial and triaxial compression creep tests on homogeneous rock and rock masses with different distributing attitudes and amounts of the structural planes are simulated by using numerical test method. Based on the simulation results,the structural effects,effects of peripheral pressure as well as the deformation behavior and failure characteristics of rock mass creep with different structures are analyzed. The results show that the attitudes of structural plane play a dominant role in the creep characteristics of rock mass,not only influencing the creep strength and displacement distribution,but also controlling the failure condition and failure mode of rock mass. The characteristics of creep curves of the rock mass derived from numerical test have a good agreement with those derived from the uniaxial and triaxial compression creep tests. It also reveals that under high stress condition,there exist some differences among these creep curves of the specimen due to the differences in the attitude of structural planes and magnitude of peripheral pressure.