Experimental Research on Treatment of Silty fine Sand Foundation with Impaction and Grind Method（IGM）

Abstract:

Based on a coastal tourism highway of Hainan Province， an experimental research was made into the treatment of silty fine sand foundation with impaction and grind method (IGM). In situ tests (SPTs, DPTs), compaction test, deflection test and real time monitoring data of groundwater level, pore water pressure and surface settlement were adopted to discuss the effectiveness and construction technology of the silty fine sand foundation with the impact roller compaction method. The results show that the key to an effective treatment of silty fine sand foundation with impaction and grind method is to take the excess pore water pressure dissipation rate at least 70% in saturated silty fine sand shallow foundation as the control standard of next round of the impact roller compaction. The reasonable construction technology not only can effectively improve the strength of silty fine sand foundation, but also can eliminate liquefaction shallow silty fine sand foundation. After the treatment, the subsoil up to the depth of 2 m is well improved.