Numerical Simulation on the Process of Rock Body Injecting GAS

In order to decrease the emission of CO2 to the atmosphere, the people begin to study the underground storage of CO2. In the process of injecting gas, the rock cracking on the action of the gas press is concerned by the people. Aiming at the problems of the fracture and the cracks extending on the action of the gas press, it uses the finite element simulation software of the tension, fracture, simulates the process of the rock body injecting gas. Firstly, based on the elastic mechanics and fracture mechanics theory, it simulates the process of the rock body injecting gas under the ground 100 meter. Because the rock tensile strength is smaller than the compressive strength, the rock body damage on the gas injection is the tensile damage on the action of the tension stress. It cracks on the top and bottom of the injection stomata and the gas press of the injection stomata decreases. Because of the crack the stress is changed around the injection stomata, it forms the stress concentration on the tip of the cracks. Through the analysis, we can see that it forms the stress concentration on the tip of the cracks in the rock fracture process. These lead the rock cracks extending and the extending direction of the cracks is consistent with the crack type I of the classical linear elastic fracture mechanics; the gas fracturing process of the numerical simulation is feasible and it can conclude the more ideal effect. It can provide the theory basis for the engineering practice.