Abstract：Dynamic compression tests of different loading frequencies on artificial joints with different saw-teeth are performed by Instron1342 servo-controlled material testing machine. Based on the analysis of test results，the effect of both the surface topography and loading frequency on the joint closure behavior is discussed. By comparison of the fitting potential of five empirical functions with the closure curves of rock joints under normal loads with different frequencies，it is suggested that the power function is very suitable for expressing the dynamic closure behavior of the joints. By analyzing the quantitative relations between the fitting parameters of power function and strain rates，a new dynamic constitutive model of rock joints is proposed. The test results show that the established model gives reasonable estimations of the deformation behavior of joints under dynamic loads.
