应力对裂隙岩体等效渗透系数影响的离散元分析

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Abstract Based on the joint information from in-situ survey and numerical simulation technique of joint(Monte- Carlo method)，the Fish language in UDEC is adopted to compile a program to generate the calculation model of fractured rockmass named DFN-GEN. DFN-GEN program can solve the problem of discrete mesh caused by the various joints. With this program，lots of random joints are generated；the fractured rockmass is meshed directly and the calculation model of fractured rockmass is generated which is finally used in the hydro-mechanical(HM) coupling calculation. DFN-GEN program is adopted to generate the calculation model of fractured rockmass and to study the hydro-mechanical coupling behavior of rockmass. Combining with TASK C of the international cooperation project DECOVALEX，the discrete fracture network(DFN) is generated and the HM behavior of fractured rockmass is studied. The effect of stress on equivalent permeability of rockmass is also analyzed. A basis is provided for engineering practice of fractured rockmass such as underground disposal of nuclear waste repository，dam foundation，slope stability and so on.

Key words： numerical simulation discrete fracture network model representative element volume(REV) equivalent permeability parameter hydro-mechanical coupling Mohr-Coulomb slide model

Received: 01 February 2010

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http://www.rockmech.org/EN/Y2011/V30/I1/176

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