The marble specimens of Jinping marble were subjected to triaxial compression test,confining compression triaxial compression test and unloading confining pressure test,and the strength evolution characteristics of marble samples under different loading paths are studied.The results show that in the constant confining pressure test,when the confining pressure increases by 5MPa,the strength of the spec-imen increases by 30％.Compared with the conventional triaxial compression test,the cohesion increased and the internal friction angle decreased in confining pressure increasing test,but it was opposite in confi-ning pressure relieving test.In different loading paths,unloading confining pressure test is easier to be de-stroyed than the conventional triaxial compression test.Because of too much plastic deformation,increas-ing confining pressure test can not improve the strength of specimens.
维普
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