A new technique preventing the earthquake-induced liquefaction called the permeation grouting method (hereafter called PGM) has been developed and applied to lots of fields in Japan, especially to the liquefiable ground beneath the existing structures and facilities. In this study, the mechanism of strength variation of sand improved by the PGM was theoretically and experimentally investigated. The advection-dispersion equation was used for analysing the permeation of injected grout which would reflect the strength variation of solidified sand. In addition, model injection tests were carried out to clarify the causes of variation in strength of solidified sand. The result reveals that the main cause of strength deviation of sand improved by the PGM may not be attributed to the dilution of injected grout, but can be attributed to the sedimentation of chemical grout during the solidification process.
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