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Abstract Joint and fracture，as the common geological defects in high-steep rock slope，can cause damage to the long-term deformation and stability of slope. In order to study the unloading rheological mechanical property of jointed and fractured rock mass，triaxial rheological tests were performed for consecutive fractured rock mass under different unloading conditions. The axial and lateral rheological characteristics of consecutive fractured rock mass present considerable anisotropy. With rheological time prolong and unloading confining pressure values increasing，the lateral rheological deformation is larger than axial rheological deformation. The rheological deformation is more fully extended and rock mass is more thoroughly disturbed under step unloading condition contrast to once unloading，while once unloading rheology more easily leads to rock mass damage through failure modes of samples. Based on test results，unloading rheological parameters of Burgers model was analyzed and the linear relations of the parameters were founded under different unloading conditions. And then，the rock mass rheological model，which can consider the effects of the different unloading paths，was established. These conclusions are very useful for theoretical research and engineering design of high-steep rock slope long-term stability.
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2015, Vol. 34 
