The Research to Obtain Fine Grained Soil's Maximum Dry Density by Fast Consolidation Compression Method

There are disadvantages both large amount of sampling quantity and large amount of labor when using compaction method to get maximum dry-density, so fast consolidation compress method is recommended. A soil sample come from Nanjing-Qidong existing railway embankment, and the sample's dry-density is 1.63g/cm
³
according to compaction method. Then undisturbed soil samples are tested under water immersed and non-immersed conditions, tests show that immersed sample needs lower compress consolidated pressure to obtain maximum dry-density. To obtain disturbed sample's maximum dry-density, standard and rapid consolidation compression method are used. Contrast tests show that sample's dry-density increased with consolidation pressure, and the 15 hits' sample compress consolidation pressure is relatively stable to reach maximum dry-density. Under 450kPa consolidation pressure, errors between dry-density of standard consolidation compression method and fast consolidation compression method and maximum dry-density is less than 1%. Considering fast consolidation method test time is short, so it is recommended to get maximum dry-density in existing railway.