Study on Influence Factors of Site Ground Motion Parameters Coupling Model

Abstract

The calculation of ground motion parameters involves many factors such as the acceleration time history of bedrock ground motion, the input interface of bedrock, the shear wave velocity of soil layer and the dynamic parameters of soil mass. And each factor has a certain degree of influence on the final calculation results. Therefore, it is necessary to conduct a scientific and effective sensitivity analysis of the factors affecting the ground motion parameters. And it is also necessary to analyze the influence degree of each factor on the result value, so as to give reasonable calculation results of site ground motion parameters. In this paper, starting with the calculation process of ground motion parameters, combined with the calculation input parameters of bedrock spectrum and the influence parameters of site spectrum, the main factors influencing the calculation results of site ground motions parameters are obtained. Aiming at the influence factors of bedrock seismic time history, bedrock input interface, soil shear wave velocity and soil dynamic parameters, the influence degree of different input parameters on the calculation results of site seismic parameters in analyzed. Finally, it is determined that the soil shear wave velocity, the dynamic triaxial parameters of sand layer and the layered thickness of soil are the key factors affecting the ground motion parameters.