Tri-axial compression test study on mechanical characteristics of oil shale under the water

Le résumé fourni par la source

For researching mechanical properties of oil-shale,a sample form Yedian of Jilin Province was obtained and studied by using the hydraulic testing enginery of YE-200A and a home-made tri-axial stress room to do tri-axial compression experiments on the oil-shale.With tri-axial compression tests under the conditions of different confining pressures and different hydration time,the evolution laws were revealed for all stress-strain,peak strength,elastic modulus and poisson′s ratio with different confining pressures and hydration times and the destructive forms of oil shale.The results showed that the hydration had a prominent influence on mechanical properties of oil shale,which reduced the peak intensity and elastic modulus of oil-shale.At the same time,owing to hydration,oil shale had obvious ductility.In addition,the comparative analysis of confining pressure and hydration showed that the strength of oil shale influenced by hydration was smaller than the natural state under certain confining pressure.Because of different fracture developments in oil shale insitu,oil-shale after hydration presented different destructive forms.

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