LABORATORY MODEL TEST OF TREATING SOFT SOIL GROUND USING DEEP AIR-BOOSTED VACUUM PRELOADING

Because of effect of well resistance and smear，deep soil can not achieve adquate vacuum when adopting the common vacuum preloading to reinforce soft soil． So deep soil can not be reinforced effectively． A method of deep air-boosted vacuum preloading to overcome the shortage of common vacuum preloading was proposed，which could improve the rate of drainage through enlarge the pressure difference between soil and the vertical drain． In addition， convection was produced between deep soil and upper soil with deep air-boosted，the rate of drainage would be improved due to that reason． Compared with the physical indicators of common preloading model test and found that the indicators of the moisture content，cross shear strength，cumulation settlement were better than those of the common vacuum preloading． It concluded that the soft soil could achieved better reinforcement through deep airboosted vacuum preloading．