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Experimental study on energy storage and dissipation characteristics of granite under two-dimensional compression with constant confining pressure

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Journal of Central South University 2021年第3期28卷 848-865页

作者： SU You-qiang GONG Feng-qiang LUO Song LIU Zhi-xiang School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Civil Engineering Southeast UniversityNanjing 211189China

To study the energy storage and dissipation characteristics of deep rock under two-dimensional compression with constant confining pressure,the single cyclic loading-unloading two-dimensional compression tests were performed on granite specimens with two height-to-width(H/W)ratios under five confining *** energy density parameters(input energy density,elastic energy density and dissipated energy density)in the axial and lateral directions of granite specimens under different confining pressures were calculated using the area integral *** experimental results show that,for the specimens with a specific H/W ratio,these three energy density parameters in the axial and lateral directions increase nonlinearly with the confining pressure as quadratic polynomial *** constant confining pressure compression,the linear energy storage law of granite specimens in the axial and lateral directions was *** the linear energy storage law in different directions,the elastic energy density in various directions(axial elastic energy density,lateral elastic energy density and total elastic energy density)of granite under any specific confining pressures can be *** the H/W ratio varies from 1:1 to 2:1,the lateral compression energy storage coefficient increases and the corresponding axial compression energy storage coefficient decreases,while the total compression energy storage coefficient is almost independent of the H/W ratio.

关键词： rock mechanics two-dimensional compression linear energy storage law single cyclic loading-unloading height-to-width ratio

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