Abstract：Research purposes: With the development and utilization of underground space of cities in China, large sections and shallow underground structure are growing at the same time. The former seismic disaster shows that the metro structure can be easily destroyed by the earthquake. One of the main reasons for metro structures destroy is saturated sandy layers liquefaction. At present there is little anti-seismic research of metro underground structure on seismic liquefaction at home or aboard.
Research conclusions:(1)Seismic liquefaction is very destructive for metro tunnel structural engineering. It should be solved carefully. (2) There are three main factors which affect the saturated sandy soil liquefaction which are dynamic load condition, embedding condition and soil texture condition.(3)The specific project should choose suitable methods which are based on buried depth of liquefaction formation, project settings and project type, to deal with seismic liquefaction. Seismic liquefaction can be solved by controlling burial depth, using underground continuous wall-enclosure, strengthening anti-floating ability of structure, and considering additional internal force which is caused by earthquake.(4)The result can be used for the technical and economic comparison in urban rail transit station and tunnel project.
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2014, Vol. 31 
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