EXPERIMENTAL RESEARCH ON HIGH VACUUM DENSIFICATION METHOD TO REINFORCE SATURATED DREDGER FILL FOUNDATION

In this paper,high vacuum densification method reinforced saturated dredger fill foundation in coastal land was introduced.Test results show: Firstly,powerful well-point dewatering can quickly decrease the groundwater table and static pore water pressure before ramming,which can effectively limit growth of super static pore water pressure in the process of ramming.Secondly,dynamic stress caused by different ramming point produces overlapping effect along the depth and the most significant soil strength appear about depth of double to treble hammer diameter.The smaller the ramming point spacing is,the better the reinforcement effect will be.While the ramming point spacing takes little impact on effective reinforcement depth.Thirdly,soil strength and foundation bearing capacity increase greatly,effective reinforcement depth is about 8 m;all these are satisfied for design requirements.It is useful and good to improve to saturated dredger fill foundation with high vacuum densification method in the practice.