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Abstract In order to understand exactly the creep property of weak intercalation in dam foundation rock，the shear creep test is carried out under different normal stresses by using step loading shear stress. The shear creep deformation law，failure mechanism and long-term shear strength of weak intercalation are concerned in this study. The results indicate that the empirical formulation can reflect the shear creep deformation law of weak intercalation properly，the average and steady-state shear creep rates increase at a exponential function with the shear stress increasing，and the shear creep failure of weak intercalation shows typical ductility failure characteristics. Based on a new method，called inflection-point method，the long-term shear strength of weak intercalation under different normal stresses is determined. The calculation results of inflection-point method are compared with that of steady-state rate method，and the rationality and validity of inflection-point method are test. The research results show that this method greatly improves the accuracy of determining the rock mass long-term shear strength and brings important reference for engineering practice.
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Received: 29 May 2012
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2013, Vol. 32 
