gravel columns foundation has been widely applied in engineering . Up to now
great achievements have been attained in the research of gravel columns foundation. In this paper the recent advances in theoretical research and dynamic analysis and criteria for liquefaction resistance of gravel columns foundation are reviewed. Firstly
the reinforcement effects of gravel columns are recognized gradually; i.e.(1)densifing the soil by squeezing and vibrationg in the progress of forming columns;(2)draining away water through gravel columns and reducing waterpressure;(3)liquefing in advance in the progress of forming columns; (4) reinforcing soil. Secondly
many achievements in the theoretical research have been made
especially in the mechanisms of drainingawaywatercolumns and focusing stress by gravel. In the past
the research was mostly concentrated on the total stress method or only the waterpressure change
while at present the research has already turned to the effective stress method and combined action between soil and water. With the development of computer
numerical simulation is provided to solve complicated problems
thus deformation of soil and change of waterpressure during an earthquake can be simulated by computer. Thirdly
the development is very slow in the criteria for liquefaction resistance of gravel columns foundation
due to the slow development in the criteria for liquefaction resistance of sand foundation. Present criteria for liquefaction of sand foundation are based on insitu tests
such as standard penetration test(SPT)
cone penetration test(CPT) or shearwave velocity measurements(VS). Corresponding criteria for liquefaction resistance of gravel columns foundation are obtained by that of sand foundation. At last a few deficiencies are pointed out in restraches of liquefaction resistance of gravel columns foundation. To overcome these deficienies
further studies are sugsested which includes:(1)influence of superstructure loads on gravel columns foundation;(2)some effective factors for the design of reinforce depth of gravel columns;(3)interact between reinforced foundation and surrounding;(4)criteria for liquefaction of gravel columns foundation considering influence of draningawaywater and focusing stress of gravel columns and additional stress for superstructure loads.