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This paper presents the results of laboratory tests conducted to investigate the effectiveness of applying methodology of a sand compaction(SCP) and a gravel compaction pile(GCP) on soft ground. The test conditions involved relatively low replacement ratios (=10, 20, and 30%) of a pile to unit cell at 1g (gravity acceleration) level. Results revealed that GCP significantly enhanced bearing capacity, settlement reduction, and consolidation rate compared with SCP. Key Words : SCP, GCP, Low replacement ratio, Bearing capacity, Settlement * Corresponding Author : Wan-Kyu Yoo (Korea Institute of Construction Technology)Tel: +82-31-336-8837 email: lyu5553@hanafos.comReceived October 24, 2012 Revised February 1, 2013 Accepted February 6, 2013 1.           (sand compaction pile,  SCP), (gravel compaction pile,  GCP)  (stone column)     .                  ,  ,      [1, 2].           SCP    ,         [3].           GCP    . SCP GCP              , (

An Experimental Study on the Behavior of Composite Ground Improved by SCP and GCP with Low Replacement Ratio