Load Carrying Capacity of Geogrid-Encased Stone Columns in Soft Ground

연약지반에 시공되는 지오그리드 감쌈 스톤컬럼의 하중지지 특성

  • Yoo, Chung-Sik (Dept. of Civil & Envir. Engrg., Sungkyunkwan Univ.) ;
  • Kim, Sun-Bin (Dept. of Civil & Envir. Engrg., Sungkyunkwan Univ.)
  • 유충식 (성균관대학교 사회환경시스템공학과) ;
  • 김선빈 (성균관대학교 건설환경시스템공학과)
  • Received : 2008.11.08
  • Accepted : 2008.11.28
  • Published : 2008.12.30

Abstract

This paper presents the results of numerical investigation on support mechanism of geogrid-encased stone columns for use in soft ground. A number of cases were analyzed using a axial-and 3D stress-pore pressure coupled model that can effectively model construction sequence and drainage as well as reinforcing effects of geogrid-encased stone columns. The results indicated that the geogrid encasement tends to significantly improve the load carrying of a stone column. Also revealed was that such a confinement effect depends on encasement length and stiffness of geogrid. It is also shown that there exist critical encasement length and stiffness of geogrid for a given condition.