Gao W.,Hunan University of Science and Technology |
Liu Z.,Hunan Kexin Electrical Power Design Co. |
Zhang Z.,Hunan University of Science and Technology
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2015
By using the FLAC3D, a numerical simulation model was generated for the uniaxial creep behavior of siltstone. Based on the user-defined constitutive model, the numerical tests for the uniaxial creep behavior of siltstone were carried out, and furthermore, the uniaxial creep properties of siltstone under different stress level were investigated. The results show that the numerical simulations may confirm the test results in either the strain magnitude or the general tendency of creep, indicating that the self-developed model is effective and feasible. The analysis also discloses that the instantaneous strain and creep at the top of specimen are more evident than those at the bottom, reflecting the stress transferring process from the top to the bottom. The change of specimen shape has little influence on the axial creep, but has a remarkable impact on the radial creep. Under the same conditions, the radial creep of cuboidal specimen is obviously larger than that of cylindrical specimen. However, the changes in diameter and height of specimens have little effect on the axial or radial creep. Hence, the conclusions attained can provide a good guidance to the laboratory creep experiment. ©, 2015, Editorial Office of China Civil Engineering Journal. All right reserved.