Hardening–Softening Constitutive Model of Hard Brittle Rocks Considering Dilatant Effects and Safety Evaluation Index

摘要: The damage and even failure of hard brittle rocks has been the most important challenge facing safety construction deep engineering works, so key to solving this problem is recognition strength characteristics description mechanical behavior rocks. Therefore, in view problem, study, we first analyzed response revealed tests of, site excavation in, Second, by analyzing rock-strength envelopes on meridional deviatoric planes, generalized polyaxial strain energy (GPSE) criterion was applied. This allows effects minimum principal stress, intermediate hydrostatic pressure, Lode’s angle stress By establishing evolutionary relationships parameters dilation with plastic volumetric rock failure, established an elasto-plastic constitutive model for based GPSE criterion. In addition, through use approach index theory dilatancy factor, evaluation degree considering dilatant proposed. Finally, study proposed were integrated into numerical simulation method simulate triaxial deformation fracture surrounding deep-buried auxiliary tunnels China’s Jinping II Hydropower Station. way, reasonableness verified. research are applicable analysis high-stress masses, which supports theoretical work related operations.