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Abstract Preferred discontinuity derived from diagenesis and tectonics reworking always results in the anisotropic characteristics of engineering rock mass. Large-scale engineering rock masses with intermittent joints set have anisotropic strength characteristic，which is influenced by the rock bridge either. So the test results of intermittent joints can not be directly used for ubiquitous joint model，while the equivalent continuum persistent joint parameters should be adopted. When the macroscopic anisotropy simulated by FLAC3D ubiquitous joint model coincides by 3DEC model，the equivalent continuum persistent joint parameters can be defined by inversion analysis. Then，indirectly equivalent continuum method has equal function with discontinuum method in describing anisotropic mechanical behavior of rock mass. In summary，numerical experiment has become a more effective way than analytical method to estimate the macroscopic parameters with random intermittent jointed rock mass. Result shows that the equivalent strength of the equivalent continuum persistent joint parameters by the combined effects of intermittent joints and the rock bridge is higher than that of the real intermittent joints. In addition，in order to keep the definition of the set of directions where the strength of the equivalent discontinuities is equal to the strength of the intermittent discontinuities containing rock bridges，the most likely apparent dip direction of the ubiquitous joint model should have ( )/2 separation angle with the real dip direction of the intermittent joints.
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Received: 28 May 2013
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2013, Vol. 32 
