The Fracture Characteristic of Mode III Rock Crack under Different Temperature

Abstract

A series of torsion tests under different temperature were carried out with circumferential notched cylindrical rock specimens. By this kind of specimens, mode III rock crack propagation in real meaning was realized. The initiation torsion M of the mode III rock crack was measured under different temperature. The variation law of M v.s. temperature T was obtained. The initiation stress near crack tip under different temperatures was calculated by finite element method, and then, the mode III fracture toughness KIIIC of the rock was obtained by further calculation. The experiment and numerical results show that the mode III fracture toughness of the rock decreases with the temperature increase. The results of the paper can be used in the design of deep underground engineering ,disaster prevention and mitigation engineering.

Studies on Mode II Rock Crack Propagation on Different Loading Environments

“…In some other underground engineering such as landfilling nuclear waste and garbage, the stability problems of fractured rock mass are also appeared under these environments. Currently, there are already some studies on the variations of the mode I fracture toughness K IC under different temperatures [1,2] , there are also some studies of the variations of the mode III fracture toughness K IIIC and the mixed mode I-III toughness under different temperatures [3][4][5][6] , so it is necessary to research the variations of the mode II fracture toughness K IIC under different temperatures and confining pressures. In this paper a new type of mode II rock crack fracture experiment has been designed and processed under different loading environments.…”