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http://dx.doi.org/10.12652/Ksce.2011.31.4C.137

Case Study on Upheaval Characteristics of Marine Soft Ground Improved by Granular Compaction Piles  

Yea, Geu Guwen (삼부토건(주) 기술연구실)
Choi, Yong Kyu (경성대학교 토목공학과)
Kim, Hong Yeon (삼부토건(주) 기술연구실)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.31, no.4C, 2011 , pp. 137-145 More about this Journal
Abstract
The amount of material upheaved owing to the installation of a granular compaction pile (GCP) in the seabed was analyzed by a field execution. The amount of material upheaved was predicted by existing equations, proposed by the Korea Construction New-Technology Association (KCNET; 2003) and Shiomi and Kawamoto (1986), and compared with the amount measured by bathymetry in the field. As a result, the upheaval heights were found to show a clear increase with increasing replacement ratio. The measured amount was larger than the amount predicted by the equations, but the amount predicted from the equation proposed by KCNET (2003) was relatively close to the measured amount. The upheaval heights were found to be more sensitive to the replacement ratio than the installation depth. The increasing trends of the upheaval heights with the installation depth as predicted by the equation of KCNET (2003) were in agreement with the measured trends at a replacement ratio of 25%. As a result of comparing the coefficients of upheaval by the equations, the coefficients of upheaval determined by the equation of KCNET (2003) were larger than those determined by the equation proposed by Shiomi and Kawamoto (1986), which were relatively close to the measured trends. Specifically, the difference between results obtained by both these equations was large when the replacement ratio was relatively low.
Keywords
granular compaction pile; coefficient of upheaval; replacement ratio; sand compaction pile;
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