Creep properties and damage model for salt rock under low-frequency cyclic loading

• DOI: 10.12989/gae.2014.7.5.569
• Publication Date: 2014-12-30T02:43:29Z
• Authors: Jun-Bao Wang; Xin-Rong Liu; Xiao-Jun Liu; Ming Huang
• Keywords: Overburden pressure

Triaxial compression creep tests were performed on salt rock samples using cyclic confining pressure with a static axial pressure. The test results show that, up to certain time, changes in the have little influence properties of rock, and curve is smooth. After this point, clearly fluctuates pressure, approximately straight line both when decreases it increases within one cycle period. slope these lines differs: greater than increases. In accordance rheology model theory, equations deduced for Maxwell Kelvin models under loading. These combined establish an equation Burgers model. We supposed that damage evolution follows exponential law during process replaced apparent stress effective stress, was obtained. suitability verified rock. fitting curves are excellent agreement curves, so proposed can well reflect behavior low-frequency particular, reflects fluctuations deformation rate as increasing decreasing different periods.