岩石材料的非线性强度与破坏准则研究_路德春.pdf

32 12 Vol.32 No.12 2013 12 Chinese Journal of Rock Mechanics and Engineering Dec. 2013 ( 100124) 4 5 2 2 Mohr-Coulomb Drucker-Prager 5 Drucker-Prager Mohr-Coulomb TU 45 A 2013 RESEARCH ON NONLINEAR STRENGTH AND FAILURE CRITERION OF ROCK MATERIAL LU DechunDU Xiuli (Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing 100124China) Abstract The nonlinear strength characteristics of rock materials under 3D stress states are studied in the deviatoric plane and meridian plane. The effect of intermediate principal stress and hydrostatic pressure as well as coupling effect of them are studied in these two planes respectively. By conducting linear interpolating of external normal vectors of octahedral plane and spatial mobilized planea model of the unified strength theory is proposed. Each kind of material corresponding to a shear failure planethen the unified strength criterion is established. The criterion has four parametersall of which have obvious physic significance and it owns continuous smooth failure plane in the principal stress space. It is verified by triaxial compression test data of five different rocks that have been published. Two transformed stress spaces are proposed based on the unified strength criterion then the criterion is transformed into Mohr-Coulomb criterion and Drucker-Prager criterion in the new stress space respectively. Triaxial compression test data sho