Creep Characteristics of Rock Mass Interior Under Uniaxial Compression

The paper is based on the similarity matching characteristics of rock mass, and took cube block as specimen with similar materials. During the process of making specimen, the improved three dimensional right angle contact strain rosette was embedded into interior of the test block. Then, the test block is placed on the YR-2000 rock creep tester for uniaxial compression test. Based on the measurement data of the internal strain of the test block, a three-dimensional strain state matrix of a certain point of creep deformation in the rock mass can be obtained. It is assumed that the center point O of the test block is the origin of the space right angle coordinate system (0,0,0), and alpha(α) is the angle of the ray OA between the xOy plane and the x axis, beta(β) is the angle of the ray OA between the yOz plane and the z axis. The three-dimensional space position of the ray OA is determined by the point O (0, 0, 0), alpha (α) angle, and beta(β) angle. And the data of alpha (α)and beta(β) angle corresponding to the maximum strain value of OA direction can be representation of creep characteristics of rock mass. The results showed that the α, β angle values and the maximum strain value are stable at low load stage. In the high load stage, when the recessive crack occurs, the α, β angle values and the maximum strain value are abruptly changed at the same time. Moreover, the α, β angle values and the strain values are reversed in the opposite direction.