基于广义Hoek-Brown非线性破坏准则的节理岩体地基承载力研究

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Abstract Considering the nonlinear failure characteristics of jointed rock mass，the 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 relation，transient 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 criterion，the 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. The results of comparative studies show that the proposed method can accurately determine the critical slip surfaces and associated values of ultimate bearing capacity of jointed rock mass foundation with reasonable accuracy.

Key words： rock mechanics bearing capacity of foundation critical slip fields Hoek-Brown nonlinear failure criterion

Received: 08 August 2011

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http://www.rockmech.org/EN/Y2013/V32/Is1/2764

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