Some influence factors on displacement characteristics of cavern group under strong earthquake

Considering the depth attenuation effect of bedrock site, the artificial seismic waves with different spectra for large-scale underground cavern group are created by trigonometric series superposition. The time-history nonlinear dynamic response analysis method is used to simulate the seismic response to the large-scale underground cavern group of some hydropower station in Southwest China; and the displacement characteristics are studied in the case of different geostresses, peak accelerations and spectra. The results show that the relative displacements of underground cavern group increase with lateral stress coefficients and peak accelerations. Furthermore, waves with different stectra result in distinct displacement characteristics. The present work could be used as a primary guidance to the aseusnuc design for underground caverns.