To study the effect of T stress on rock fracture toughness, fracture toughness tests were conducted on half disk rock specimens with crack inclination angles of 5°, 10°, 15°, 20°, 25°, 30°, 25°, and 40°. Based on the crack propagation criteria, the fracture toughness and T stress of the rock were calculated from the test data. With the increase of rock crack inclination, the T-stress and maximum load of rock increase, and the fracture toughness of rock increases with the change of stress. T stress has a significant impact on rock fracture toughness, and there is a positive correlation between rock fracture toughness and T stress. Rock fracture toughness increases with the increase of T stress, and rock crack propagation is controlled by the singular stress at the rock crack tip. When T stress is considered, rock cracks do not extend in the direction of prefabricated cracks.

Zhang Xiaodong. Study on the influence of T stress on rock fracture toughness. Academic Journal of Engineering and Technology Science (2023) Vol. 6, Issue 7: 35-39. https://doi.org/10.25236/AJETS.2023.060707.

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