Abstract
To prevent damages due to liquefaction, the silty ground was improved by sand compaction pile (SCP) method. To decide sand pile spacing, large scaled experimental work was carried out by varying sand pile spacings. The improved ground was evaluated by standard penetration test (SPT), piezocone test (CPT) and dilatometer test (DMT). These data were analyzed to estimate the liquefaction resistance by various evaluation methods, following to technical standards for port and harbour facilities in Japan (SPT); Robertson and Fear (CPT); Robertson and Campanella (DMT). It was found that the effectiveness of improvement is dependent on the content of fine-grained soil for SCP piles and that the estimation of liquefaction resistance is highly affected by the type of method used for the fine-grained soil evaluation.
