2012 Volume 68 Issue 4 Pages 583-596
In an attempt to examine the efficiency of plastic board drain for promoting consolidation of super-high water content clay, various kinds of in-situ measurement were carried out in a pond at Kobe airport. As expected before the ground improvement, it was manifested that the consolidation was achieved by the difference of total water head between the Plastic board drain and the clay. In addition to it, it was confirmed that the self-weight consolidation of the super-high water content clay takes place involved with no dissipation of excess pore water pressure in the clay. On the other hand, the applicability of ball-cone penetration test for estimating water content of the super-high water content clay was confirmed well by showing a good agreement with the direct measurement from the retrieved clay sample. Furthermore, it was well demonstrated that the plastic board drain even when deformed largely functioned well as the drain.