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http://dx.doi.org/10.7843/kgs.2008.24.12.93

Investigation on Support Mechanism of Geogrid-Encased Stone Columns in Soft Ground  

Yoo, Chung-Sik (Dept. of Civil & Engrg., Sungkyunkwan Univ.)
Kim, Sun-Bin (Dept. of Civil & Engrg., Sungkyunkwan Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.24, no.12, 2008 , pp. 93-101 More about this Journal
Abstract
This paper presents the results of numerical investigation on support mechanism of geogrid-encased stone columns for use in soft ground improvement. A number of cases were analyzed using a 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 provides additional confinement effect that reduces vertical stress in the soft ground, thus resulting in less excess pore water pressures and associated settlement. 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.
Keywords
Finite element method; Geogrid; Soft ground; Stone column; Stress-pore pressure coupled analysis;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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