The study on fracture energy release rate G ∼ C of the reservoir ice layer in different loading rate

The fracture energy release rate G ∼ C , which is the important parameter of ice pressure calculation model that is built on energy balance method, is the fracture mechanics performance of ice material. It is related with these factors such as ice material loading rate P • , which must be measured by experiment. It is the experimental method of fracture mechanics used in this paper. These ice specimens on the different thickness loading rate P • were tested with fracture mechanics method at low-temperature testing machine, to obtain the fracture flexibility change rate d/da(1/M) of ice body which contains pre-crack and the values of P — Δ under different conditions of P • , which could determine fracture energy release rate G ∼ C of ice body during the ice pressure generated, which provide the necessary experimental data to establish ice layer pressure calculation model for the application of energy balance method.