循环热力作用岩石Ⅰ型断裂试验方法及其可行性研究OA

It's great significant to explore the fracture characteristics of rocks after cyclic stress and cyclic tempera-ture for ensuring the stability of underground compressed air energy storage,a"double carbon"project.An experi-mental test method for the mode-Ⅰ fracture characteristics of rocks after cyclic thermal effects was proposed and the feasibility of the method was studied.In order to study the stress deformation characteristics and mode-Ⅰ fracture characteristics,the corresponding rock specimens with cracks were designed as well as the corresponding test pro-cedures;COMSOL Multiphysics software was used to simulate increase and decrease temperature and uniaxial com-pression test and the phase field fracture method was used to simulate the three-point bending beam fracture test to obtain the the corresponding thermal response and crack path.The applicability and feasibility of the test method was demonstrated.Numerical simulation results show that the test method can obtain the temperature field,stress field and crack propagation path with the minimal theoretical errors.The method can test only one specimen to ob-tain the stress-deformation characteristics during the cyclic thermal-mechanical loads and the mode-Ⅰ fracture characteristics after cycling.