Shaking Table Test For Subway Station Of Tai Yuan Metro Line Two

Structure damage causing by liquefaction in saturated sand metro station under strong earthquake is the key problem of urban rail transit engineering. In this paper, the subway station in Taiyuan is taken as the research object, and the vibration test of saturated sand metro station model is carried out by means of shaking table model test.The condition of actual engineering soil character, station structure design , the shaker ability and model test tank size have been taken into account. Considering in the reasonable model of geometric similarity ratio and dynamic characteristics analysis based on similarity model, an organic glass underground structure and saturated sandy soil stratum filled with same particle composition have been made in the model test tank. At the same time, the acceleration sensor, the pore pressure meter and the earth pressure gauge are embedded at the bottom, the bottom plate and the roof of the station. Elcentro seismic wave and Nanjing artificial wave was Selected to simulate seismic motion with different frequency amplitude.The seismic waves with different amplitudes have being input, vibration act on the underground structure model and saturated sand soil in the groove. Acceleration response of saturated sand and underground structure interaction curves, dynamic pore water pressure curve and the cumulative development of soil underground structure interaction variation of earth pressure are obtained. Acceleration amplitude frequency characteristics on different cross sections and different depth are analyzed, the result shows that the frequency of saturated sand is about 0.5-2Hz, the frequency of interaction between structure and soil is about 7.5-lOHz, and the formation of underground structure has obvious amplification effect to dynamic pore water pressure on different section and different depth are analyzed, the result reveals that increases with range the peak acceleration gradually expanded, effect of peak acceleration 0.2g Elcentro earthquake wave, the underground structure in saturated sand under that floor The underground structure has a floating motion. Model test considering foundation pit of underground continuous wall shows that the deformation due to inhibition of formation of the ground and underground continuous wall near the enclosure and dynamic shearwhich can be inhibited the foundation soil liquefaction and prevention station structure floating displacement. The research results have important guiding significance for the construction of Taiyuan metro.