Abstract: The intercalation is a common geological structure, and it significantly influences the stress wave propagation and its response to rock mass under the seismic or blasting loads. In the past studies, the researches focus on vibration isolation performance and transmissivity of stress wave propagation at intercalation. However, the energy evolution of stress wave in the process of multiple refraction and reflection in intercalation are seldom investigated, and the stress response and failure of intercalation have not been well analysed. Therefore, the variation laws of energy coefficients in the propagation process of stress waves were studied by theoretical analysis. The influence of the wave impedance of rock mass and the angle of incidence of stress wave to the accumulated energy coefficients of stress wave in the intercalation are analysed, as well as the intercalation stress response and the dynamic safety coefficients of a plane failure slope. As a result, the residual energy coefficients of stress wave decreased exponentially with the times of refraction and reflection during the stress wave propagation in the intercalation. It was found that the residual energy of stress waves could be neglected after the fourth refraction and reflection. The differences in accumulated energy coefficients of stress waves in the different media increased with the relative differences of wave impedance between the intercalation and surrounding rock. Under the incident of the plane harmonic wave, the shear stress and shear strength in the intercalation exhibited a fluctuation of the same frequency as the incident wave. Compared to P-wave incident, SV-wave incident generated greater shear stress in the intercalation, and caused the greatest impact on the slope stability. When the SV-wave was incident, the safety factor of the slope was more sensitive to the dip angle of intercalation than that when P-wave incident, and the safety factor decreased more rapidly with the increase of the dip angle.

Key words: intercalation, energy coefficients, stress response