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| STUDY OF ENERGY PROPERTIES OF SANDSTONE
UNDER DIFFERENT LOADING PATHS |
| HE Mingming，CHEN Yunsheng，HAN Tielin，YU Zhao，HAN Kang |
| (Institute of Rock and Soil Mechanics，Xi?an University of Technology，Xi?an，Shaanxi 710048，China) |
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Abstract Triaxial compression for sandstone sample under three paths，i.e. axial loading and radial constant，axial loading and radial unloading，axial constant and radial unloading are realized on WDT–1500 reactive material testing machine. The energy dissipation law in process of deformation under these stress paths and the relationships between energy and rock specimen deformation and confining pressure are analyzed comprehensively. A new method of determining rock failure point is proposed under different paths by studying on the relationship between energy and axial strain. The test results show that there are both energy dissipation and energy release under different stress paths and energy release cause failure. Especially，the energy dissipation is largest under axial loading and radial constant. The energy dissipation of sandstone under these three stress paths are mainly influenced by initial axial pressure and initial radial pressure，but the energy dissipation will obviously bring confining pressure effect in the different deformation stages.
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2015, Vol. 34 
