Investigation of Seismic Response of S-Wave Incident Bedrock-Saturated Soil-Unsaturated Soil Site under Thermal Effect

Abstract

Based on the propagation theory of elastic wave under thermal effect, a model of S-wave incident bedrock-saturated soil-unsaturated soil site is established to study the issue of seismic ground movement under the site. The analytical solution of the seismic ground motion of the bedrock - saturated soil - unsaturated soil site can be derived from the analysis of the wave field in the site under thermal influence. By numerical simulation, the influence of physical and mechanical parameters such as temperature, thermal conductivity, saturation and groundwater level on the ground motion of the site earthquake is analysed. The results show that the amplification coefficients of the horizontal and vertical displacement of the site are significantly differ between the thermal effect and isothermal condition models. The variation in the thermal expansion factor and the Kelvin temperature of the medium significantly influences on the amplification factor of the vertical ground motion, while the variation of the thermal conductivity factor and the phase delay time of the heat flow have little influence on the amplification factor of the surface ground motion. As the angle of incidence increases, the amplification factor of the horizontal surface displacement gradually decreases, and the amplification coefficient of the vertical displacement first increase and then decrease. The amplification parameter of horizontal displacement of surface decreases with increasing groundwater level and saturation, while the amplification parameter of vertical displacement grows.