PREDICTION METHOD FOR LIQUEFACTION-INDUCED SETTLEMENT OF EMBANKMENT WITH REMEDIAL MEASURE BY DEEP MIXING METHOD

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In order to mitigate liquefaction-induced embankment settlement, remedial measures are often implemented for existing embankments. This paper describes a practical prediction method for embankment settlement due to foundation liquefaction, which are remedied with the deep mixing method. Based on a number of centrifuge shaking tests of embankment, an empirical relation between crest settlement and displacement of the remedied zone is established. Then, a calculation method for displacement of the remedied zone is developed. In the method, a macroscopic failure envelope and a plastic displacement potential in the general load space are considered to evaluate the subgrade reaction forces on the base of the remedied zone. The method is capable of calculating not only horizontal, vertical or rotational displacement alone, but their combined effect. The method is validated through comparisons of calculated results with centrifuge test observations. The calculated displacement components compare quite well with those measured. This method can be a useful tool for design of countermeasures based on a specified limit settlement.

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