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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 mechanical characteristic of sandstone comparatively from deformation property，strength property，failure feature and its mechanism are analyzed and researched. The test results show that strength of sandstone is reduced，but deformation of radial and its expansion of capacity under the same principal stress increase significantly under axial loading and radial unloading，axial constant and radial unloading relative to axial loading and constant radial，and especially under axial loading and radial unloading the expansion of capacity is largest；the deformation property and strength property of sandstone under these three stress paths are mainly influenced by initial axial pressure and initial radial pressure，but the influence of the unloading speed of radial pressure on mechanical characteristics of sandstone is not clear. The failure characteristics of samples under axial loading and constant radial present shear failure，but the failure characteristics of samples often present mixed tensile-shear failure under axial loading and radial unloading，axial constant and radial unloading.
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Received: 14 April 2012
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2012, Vol. 31 
