EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS OF SANDSTONE UNDER DIFFERENT LOADING PATHS
HAN Tielin1，CHEN Yunsheng1，SONG Yongjun2，LI Weihong1，YU Zhao1
(1. Institute of Geotechnical Engineering，Xi?an University of Technology，Xi?an，Shaanxi 710048，China；
2. School of Highway，Chang?an University，Xi?an，Shaanxi 710064，China)
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.
韩铁林1，陈蕴生1，宋勇军2，李伟红1，余 朝1. 不同应力路径下砂岩力学特性的试验研究[J]. 岩石力学与工程学报, 2012, 31(s2): 3959-3966.
HAN Tielin1，CHEN Yunsheng1，SONG Yongjun2，LI Weihong1，YU Zhao1. EXPERIMENTAL STUDY OF MECHANICAL CHARACTERISTICS OF SANDSTONE UNDER DIFFERENT LOADING PATHS. , 2012, 31(s2): 3959-3966.
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2012, Vol. 31 
