Abstract:Based on the assumption that the behavior of surrounding rocks conforms to that of Kelvin-Voigt model,a method to determine the parameters related to the time-dependent properties of surrounding rocks is established and the ground displacement of a test tunnel of an underground hydro-power station cavern is predicted by using the measured data. The measured data is revised to consider the space effect of excavation face. The total displacement values are treated by regression to derive the displacement-time curves. The formula to describe the relation between equivalent elastic modulus of the surrounding rock and the displacement values at different moments is also established. The case study shows that the predicted displacements by the method agree well with the measured values,so the proposed method can be adopted in practice.