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在常规三轴室中进行了花岗岩试件在恒定轴压下的围压却荷试验份析了岩石在卸荷条件下的变形和强度特性，回归得到由卸荷导致岩石破坏的强度经验准则．
In a conventional triaxial chamber, the compressive and compressive load tests of granite specimens under constant axial pressure were carried out to analyze the deformation and strength characteristics of the rock under unloading conditions. The empirical strength criterion of rock failure caused by unloading was obtained by regression.