Study of shear deformation constitutive model of weak intercalated layers in slope

The mechanics characteristic experiments of the weak intercalated layers in the slope rock mass are carried out. Basing on the test results, the shear deformation constitutive models are discussed. The common constitutive models are hyperbola and exponent models; but it can be indicated that the calculation results from the two models is less than the actual results. By studying the two models, it is found that the shear stiffness calculated by the two models are the 2 and 1 powers of the shear stress respectively; and which are the 1 basic function of the shear stress; and can not show the real constitutive models of the weak intercalated layers. So the power function model of the K-s -tau is built; the definition of the power function is decided by the 'n', which can be gotten by regressive analysis. At last, the power function models under different normal stresses. The results indicate that the power functions is more close to the experiment results. It can be said that the power function model used to describe the shear deformation constitutive model is reasonable.