The testing methods on fracture toughness of the reservoir ice layer in different temperature and loading rate

Referenced the fracture mechanics theories, based on the consideration of the destruction characteristics, the cementation force of ice in the ice and fictitious crack, the wing crack fracture model of base layer of reservoir Ice Layer, the fracture toughness, is the fracture mechanics performance of ice material, 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 were tested with fracture mechanics method at low-temperature testing machine, to obtain the fracture flexibility change rate of ice body which contains pre-crack and the values of under different conditions of T and Ṗ, which could determine fracture toughness G̅_c of ice body during the ice pressure generated, It is a meaningful attempt to research the anti-frost ice layer of reservoir in seasonal permafrost regions, and provides a reference for stability design.