Sensitivity Analysis of Seismic Response Parameters for Saturated Sand Site-Subway Station

In order to further study the parameter sensitivity of the ground motion response of the saturated sandy soil site-subway station structural system, a single-story double-span subway station was taken as the research object, and the saturated two-phase medium effective stress dynamic solution method was adopted to establish a saturated sand The coupled dynamic numerical analysis model of soil field-subway station structure system selects soil shear modulus, permeability coefficient, internal friction angle and ground motion intensity as sensitive influencing parameters, and further conducts grey relational analysis on the basis of reference value error analysis , the grey correlation degree sequence of the influencing factors of ground motion response is obtained. The calculation and analysis results show that the peak value of dynamic pore pressure ratio in the near-field characteristic point is more sensitive to the changes of ground motion intensity and soil shear modulus, while the peak acceleration value