Construction method of soft soil foundation of hydraulic engineering

The invention discloses a construction method of a soft soil foundation of hydraulic engineering. The method comprises the following steps: (1) defining a construction area, leveling the field, and cleaning soft soil on the surface layer; (2) distributing piles in a regular triangle form; driving out pile holes; feeding precast piles into the pile holes; and pouring fillers in the centers of the precast piles and between the precast piles and the pile holes; (3) laying a sandstone layer with the thickness of 30-50cm; paving 1-2 layers of wood grilles in the middle of the sandstone layer; statically pressing in 10-15 times through a road roller in a reciprocating manner at every 8-10h; and inserting vacuum pipes into water draining pipes in the precast piles to drain water after static pressing; and (4) adding a curing agent and a proper amount of water into the soft soil obtained in the step (1) to prepare backfill soil; paving the backfill soil above the sandstone layer until the paving thickness is 30-40cm;