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Energy evolution characteristics and distribution law of rock materials under Triaxial Cyclic Loading and unloading compression

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Document pages: 16 pages

Abstract: In order to explore the influence of confining pressure on the energy evolution characteristics of loaded rock, triaxial cyclic loading and unloading tests of sandstone were carried out under six confining pressures by using axial loading and circumferential deformation control modes. The total energy density, elastic energy density and dissipated energy density of rock samples under different confining pressures are obtained. The evolution process and distribution law of confining pressure effect on energy accumulation and dissipation are analyzed. The energy conversion mechanism of rock from deformation to failure is revealed, and the energy conversion equations of different stress-strain stages are established. Indicates the accumulation, dissipation and of rock energyd release behaviors by energy storage limit density, maximum dissipated energy density, and residual elastic energy density was established. The rock showed that, with the increase of confining pressure, the characteristic energy density of rock increased in the power exponent form, and the energy storage limit density increased faster than the maximum dissipated energy density. The greater the confining pressure was, the greater the proportion of elastic energy before peak was. It is indicated that the confining pressure increased the energy inputting intensity, improved the energy accumulating efficiency, and inhibited the energy releasing degree.

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