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WANG Gang~(1,+) ZHANG Jianmin~2 1 Ertan Hydropower Development Company,LTD,Chengdu 610021,China 2 School of Civil Engineering,Tsinghua University,Beijing 100084,China  
Main framework and topics of seismic liquefaction study are summarized,including the current state of the art and trends,with respect to mechanism of liquefaction,susceptibility of liquefaction,liquefaction flowslides,liquefaction-induced deformation and numerical modeling techniques.It is shown that the key issues of seismic liquefaction in practice are related not with strength but with deformation.The liquefaction-induced deformation evaluation techniques can be diveded into two categories:(1)empirical methods based on statis- tical analysis of historical seismic liquefaction deformation database and(2)numerical modeling.Numerical modeling is shown to be an effective tool and have widespread prospect for analysis of complex boundary value problems of seismic liquefaction.In future seismic liquefaction research,it is important to improve the existing methods of liquefaction susceptibility analysis and liquefaction-induced deformation evaluation by establishing and analyzing the seismic hazard database.But more emphases should be placed on revealing the mechanism of seismic liquefaction,developing constitutive models that can describe the stress-strain behavior of sand over a small to large strain range during an entire pre-and post-liquefaction process,and developing corresponding numerical algorithms to implement the models in the simulation of practical boundary-value problems.
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