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Smear Effect on Consolidation Behaviors of SCP-improved Ground  

Kim, Yun-Tae (Dept. of Ocean Engrg., Pukyong National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.20, no.2, 2004 , pp. 59-66 More about this Journal
Abstract
Sand compaction pile (SCP)-improved ground is composite soil which consists of the SCP and the surrounding soft soil. When a surcharge load is applied to composite ground, time-dependent behaviors occur in the composite soil due to consolidation according to radial flow toward the SCP. In addition, stress transfer also takes place between the SCP and the soft soil. This paper presents the numerical results of cylindrical composite ground that was conducted to investigate smear effect on consolidation behaviors of SCP-improved ground. The results showed that the smeared zone of soft clay had a significant effect on effective stress-pore water pressure response, stress transfer mechanism and stress concentration ratio of composite ground. Amount of stress transfer between the clay and the SCP was maximum in depth of z/H=0.25, and decreased with depth. Stress concentration ratio of composite ground was not constant, but depended on consolidation process. It was also found that the value of stress concentration ratio in soft clay with smeared zone was larger than that in soft clay without smeared zone.
Keywords
Composite ground; Consolidation; SCP; Smear; Stress transfer;
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