Abstract
Deformation of wick drains or Prefabricated Vertical Drains (PVD) due to consolidation settlement during preloading can reduce or shut off entirely discharge capacity of PVD. Consequently, degree of consolidation of soft soil is diminished with time during consolidation. This study takes variation of (qw) due to PVD deformed during consolidation process under preloading into account for soft ground improvement using PVD. Effect of deformed PVD on discharge capacity was investigated by back analysis using the field monitored data of the two complete soft ground improvement projects using PVD: the approaching embankment of the Phu My bridge project, and the embankment of Vo Van Kiet Boulevard in Ho Chi Minh City, Vietnam. The results indicate that discharge capacity of PVD was reduced about 71% and 47% when the field settlements reached 1.76 m and 1.73 m for the two projects, respectively.
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