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Abstract Through stability of many fractured rock masses slopes on Guangle highway，conclusion obtained that objective geological model，appropriate constitutive relation，accurate parameters and effective calculation method are the key problems for stability evaluation. The joint finite element method(JFEM) is proposed. In the method，the fractured rock massed are composed of rock block and fracture network，the properties of rock block and joint are considered simultaneously，reflecting the nonlinear relation of contaction fully. Firstly，based on the single structure surface theory proposed by Jaeger，the compression strength of fractured rock massed is calculated by JFEM，which verifies the reliability of the JFEM. Secondly，introducing discrete fracture network model，the stability of fractured rock masses is discussed based on Voronoi model，Baecher model and Veneziano model. The generalized Hoek-Brown criterion and Barton-Bandis criterion are applied to rock block and joint，respectively. Using the strength reduction method to calculate stability factor，the influences of key parameters in DFN on the slope stability are discussed. The research provides a new idea for the stability evaluation of fractured rock masses and theoretical basis to engineering decision.
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Received: 18 May 2012
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2013, Vol. 32 
