Study On Calculation Theory And Method Of Three Dimensional Seismic Response Of Subway Station Structures In Soft Soil

With the rapid development of economy, the dimension of subway constructionis extended increasingly. And at the same time, in order to work together with theaffiliated structures, some more and more subway station structures often constructedwith the exploitation of underground space, which makes their continuous wall to bediscontinuous. So, it is a challenge to subway station structures of its aseismaticability. Some old aseismatic measures and methods in design and construction needadjust to satisfy the aseismatic demand of complicated subway station structures. It isnecessary and pressing to study the aseismatic ability of typical subway stationstructures and underground syntheses.It is showed clearly from Kobe Earthquake and other large earthquake in thehistory that the destructive degree caused by seismic will be enlarged in soft soil areas.The depth of soft soil in Shanghai is about from 250m to 300m. Silty clay, clay andthe liquefiable silt are common in the shallow soil layer, which can magnify the harmto the underground structures during seismic. Much attention should be paid toanalysis theory and design method for subway station structures and tunnels in softsoil in Shanghai. People have begun to attach importance to establish seismic designtheory and calculation method in recent ten years, and several calculation methodshave been proposed. But, there were obvious differences between the calculationresults by different calculation methods or calculation model because of too manyinfluencing factors to the seismic response of underground structures, and it isdifficult to distinguish their rationality too. Experimental study is an effective meansto solve the problem, and the progress of computer and calculation technique is alsoprovides a powerful tool.A three-dimensional calculation method, which used to calculatethree-dimensional seismic response of subway station structures in soft soil, will beestablished based on the fitting analysis of the shaking table model test of subwaystation structures. Then, the method will be applied to engineering practice to studythe seismic response rule of typical subway station structures and undergroundsyntheses.The main content of the paper including the followings four aspects:1. A polynomial fitting formula will be proposed based on the fitting analysis of the data coming from the soil dynamic test. The formula can be used to fitting therelation between static and dynamic parameters of soft soil in Shanghai. The dynamicparameters can be determined approximatively by the formula when the soil dynamictest data is lacking or in the elementary design stage of the engineering;2. The typical subway station structures shaking table model tests were fitted andanalyzed, and a three dimensional calculation method on seismic response of subwaystation structures model is established;3. A three-dimensional calculation method on seismic response of subway stationstructures is established based on the three dimensional calculation method on seismicresponse of subway station structures model;4. The three-dimensional method will be applied to engineering practice. Thethree-dimensional seismic response of typical subway station structures andunderground syntheses with lateral consecutive holes is studied. The worst parts andthe increased ratio caused by seismic load will be determined. And the seismicbehavior of the structures is verified.Finally, the research work in the paper is summarized and the problems requiringfurther study are discussed.