Analysis on the Consolidation Behavior of the Smeared Soil Considering Vertical Drain Spacing

스미어 발생지반에서 배수재 간격비에 따른 압밀거동 분석

To investigate the effect of drainage spacing and smear on the rate of consolidation, a large consolidation chamber and mandrel insertion device were developed. After the occurrence of smear by installation of sand drain, model ground was consolidated in either overconsolidated or normally consolidated state. As smear effect increases and thus drain spacing decreases, total settlement increase in overconsolidated state but has no effect in normally consolidated state. Efficiency of vertical drain decreases and consequently consolidation time increases in all tests as smear effect becomes significant.