Newly hydraulic fill mud is high-water-content

poor permeability and zero capacity

for which the conventional ground treatment techniques cannot be used and many difficulties will arise.This paper introduces composite negative-pressure consolidation consisting of three working procedures

namely modified vacuum preloading

electro-osmosis dewatering and dynamic consolidation.Modified vacuum preloading reinforces newly hydraulic fill mud to reach a certain intensity and concretion to prepare further treatment.Electro-osmotic dewatering can decrease effectively underground water level and water content

facilitate dissipation of excess pore-water pressure.Hydraulic fill mud is strengthened under the coactions between electro osmosis dewatering and heavy tamping.According to engineering test

soil experiment

monitoring for the settlement deformation

the experiment shows that the electro-osmotic dewatering can also reduce sharp growth of excess pore water pressure during dynamic compaction

and promote dissipation quickly

obviously improving the effectiveness of the technology.avoid the occurrence of "spring soil" and increase clearly optimum ramming energy.The composite negative-pressure consolidation technology can be effectively used in the foundation newly hydraulic fill mud.