5.1.2 Ground improvement
The ground improvement was carried out, following the spread-
ing sand blanket. In the second phase construction site, the sand
drain method (SD), the sand compaction pile method (SCP), the
deep mixing method (DM) and the marine plastic drain method
(MPD) was adopted. Figure 7 shows the location of each
method of ground improvement. The second phase island has
settled as it was predicted, as mentioned in the following sec-
tion. This implies that the improved ground have no defect such
as discontinuity of the sand pile. Ground improvement was car-
ried out night and day to double the pace of execution, resulting
in the completion of the work two or three months ahead of the
initial schedule. The outlines of the ground improvement meth-
ods are described below.