Energy evolution and failure mechanism of diabase under different stress paths

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (14) : 154-161.

MIAO Shengjun，DUAN Yixuan，YIN Ziwei，LIU Zejing

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Abstract

The single & tri axial cyclic loading-unloading pressure test and the constant axial unloading confining pressure test were carried out on the diabase in Lingbao mining area as the research object. The stress-strain curves and damage patterns were analyzed, and the energy evolution process and damage mechanism of diabase under different stress paths were studied. The study shows that in the process of deformation and damage by triaxial cyclic loading-unloading, the area of the hysteresis loop gradually increases with the increase of the number of cycles, and the dissipation energy and elastic energy of the rock sample both increase, and the growth rate of dissipation energy gradually becomes larger, and the growth rate of elastic energy gradually becomes smaller, and the larger the enclosing pressure is, the larger the energy dissipation ratio is, and the fracture expansion and confluence phenomenon inside the rock sample increase significantly; in the process of deformation and damage by constant axial unloading confining pressure, the influence of the confining pressure on the compressive strength and lateral deformation of diabase increases significantly. In the process of constant axial unloading confining pressure, the influence of confining pressure on the compressive strength and lateral deformation of diabase is greater; under the same initial confining pressure, the elastic energy density of specimen destruction is greater under the unloading stress path compared with the cyclic loading-unloading stress path.

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cyclic loading-unloading pressure test / unloading confining pressure test / failure mechanism / confining pressure effect

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MIAO Shengjun，DUAN Yixuan，YIN Ziwei，LIU Zejing. Energy evolution and failure mechanism of diabase under different stress paths[J]. Journal of Vibration and Shock, 2023, 42(14): 154-161

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