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http://dx.doi.org/10.7843/kgs.2014.30.4.5

A Comparative Study of Structural Analysis on DCM Improved by Pile and Block Type  

Shin, Hyun Young (DaeWoo E&C)
Kim, Byung Il (Expert Group for Earth and Environment)
Kim, Kyoung O (DaeWoo E&C)
Han, Sang Jae (Expert Group for Earth and Environment)
Publication Information
Journal of the Korean Geotechnical Society / v.30, no.4, 2014 , pp. 5-19 More about this Journal
Abstract
In this study, the structural analysis is performed on the method of shallow block and deep cement mixing pile, and then their characteristics and associated behaviors were analyzed. In the case of continuous beam analysis, the predicted settlement was very small, and shear force and bending stress are somewhat overestimated. The frame method is similar to numerical analysis in the internal force shallow block and long pile, but because the settlement of pile is underestimated, the additional calculation using the reaction of the long pile is necessary. For soil arching method and piled raft foundation method, the excessive axial force of long pile was predicted because the load sharing of pile is very large compared to the other methods. In the behavior of the shallow block and deep pile method, the settlement of shallow block and contact pressure are much in the center than the edge. In the estimating method considering the interaction between improved material and ground, the load sharing of the soil-cement pile ranges from 20% to 45%, and the stress ratio is 2.0~5.0 less than piled DCM. The maximum member forces at the boundary conditions of pile head are similar, but in fixed head the axial force and vertical displacement are different in accordance with pile arrangement.
Keywords
DCM; Block type; Pile; Structural analysis; Stress ratio;
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