Experimental Observations of Settlement of Footings Supported on Soft Clay Reinforced with Granular Columns: Laboratory Model Study

D K Noor Muneerah PG Haji Jeludin, V. Sivakumar, B. C O'Kelly, P. A. MacKinnon

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The inclusion of granular columns in soft clay deposits leads to improvements in bearing capacity and overall stiffness along with a reduction in consolidation settlement. Many laboratory investigations have focused on aspects of bearing capacity, but published data on settlement performance is limited. This paper reports on some interesting findings obtained from a laboratory model study in respect of these issues. In this investigation, 300 mm diameter by 400 mm long samples of soft kaolin clay were reinforced with single or multiple granular columns of various lengths using the displacement and replacement installation methods. The experimental findings revealed that, for the same area replacement ratio, limited settlement reduction was achieved for single long floating columns and end-bearing column groups. Marginal improvements in settlement performance were also achieved for columns installed by the displacement method. No settlement reduction was achieved for short single floating columns while short floating granular column groups produced increased settlements. These observations were verified using contact pressure measurements between the footing and column/surrounding clay.
Original languageEnglish
Article number04015063
Number of pages15
JournalJournal of Geotechnical and Geoenvironmental Engineering
Issue number1
Early online date22 Jul 2015
Publication statusPublished - Jan 2016


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