基于广义Hoek_Brown非线_省略_破坏准则的节理岩体地基承载力研究_师林.pdfVIP

32 1 Vol.32 Supp.1 2013 1 Chinese Journal of Rock Mechanics and Engineering Jan .2013 Hoek-Brown 12 12 12 (1. 230009 2. 230009) Hoek-Brown Hoek-Brown Mohr-Coulomb Mohr-Coulomb Hoek-Brown GSI mi Hoek-Brown TU 452 A 2013)1276408 STUDY OF BEARING CAPACITY OF JOINED ROCK MASS FOUNDATION BASED ON GENERALIZED HOEK-BROWN NONLINEAR FAILURE CRITERION SHI Lin12 ZHU Dayong12 SHEN Yinbin12 (1. School of Civil EngineeringHefei University of Technology Hefei Anhui230009China 2. Anhui Provincial Laboratory of Structure and Materials of Civil EngineeringHefei Anhui230009China) Abstract Considering the nonlinear failure characteristics of jointed rock massthe critical slip field method is modified based on the generalized Hoek-Brown failure criterion to calculate the bearing capacity of joined rock mass foundation. By transforming the shear strength of each point on the Hoek-Brown strength envelope into the Mohr-Coulomb linear relationtransient internal friction angle and cohesion of each point are calculated and the critical slip field method based on the Mohr-Coulomb criterion is improved and a new iterative procedure is thus established. Using the newly developed critical slip field method based on the Hoek-Brown failure criterionthe passive earth pressure and ultimate bearing capacity of jointed rock mass foundation are computed. The effects of values of GSI and mi on ultimate bearing capacity of foundation are comprehensively analyzed. T