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Effectiveness of Stone Columns for Liquefaction Mitigation of Silty Sands with and without Wick Drains
Pre-fabricated vertical (wick) drains have been used in conjunction with stone columns to improve treatment effectiveness in sands with high fines content. However, no comparison testing has been performed with and without drains. In this study, side by side comparisons demonstrated improved performance of stone columns with drains relative to that without drains. Despite the presence of wick drains, improvement effectiveness still decreased as the fines content increased. The average increase in SPT (N1)60 was 114% in a zone with an average of 31% fines, but decreased to about 70% in a zone with an average fines content of 43%. Treatment effectiveness was often minimal in layers containing 15% or more clay sized particles. Significant increases in SPT values were observed with time after treatment in the test areas with drains, but little improvement with time was observed in areas without drains. Increased penetration resistance was similar to that observed at other stone column projects where similar soils were encountered and wick drains were also used.
Effectiveness of Stone Columns for Liquefaction Mitigation of Silty Sands with and without Wick Drains
Pre-fabricated vertical (wick) drains have been used in conjunction with stone columns to improve treatment effectiveness in sands with high fines content. However, no comparison testing has been performed with and without drains. In this study, side by side comparisons demonstrated improved performance of stone columns with drains relative to that without drains. Despite the presence of wick drains, improvement effectiveness still decreased as the fines content increased. The average increase in SPT (N1)60 was 114% in a zone with an average of 31% fines, but decreased to about 70% in a zone with an average fines content of 43%. Treatment effectiveness was often minimal in layers containing 15% or more clay sized particles. Significant increases in SPT values were observed with time after treatment in the test areas with drains, but little improvement with time was observed in areas without drains. Increased penetration resistance was similar to that observed at other stone column projects where similar soils were encountered and wick drains were also used.
Effectiveness of Stone Columns for Liquefaction Mitigation of Silty Sands with and without Wick Drains
Rollins, Kyle M. (author) / Quimby, Michael (author) / Johnson, S. Robert (author) / Price, Bradford (author)
U.S.-China Workshop on Ground Improvement Technologies 2009 ; 2009 ; Orlando, Florida, United States
Advances in Ground Improvement ; 160-169
2009-03-10
Conference paper
Electronic Resource
English
Columns , Drainage , United States , Slope stability , Soil liquefaction , Silts , Embankments , Stones , Soil stabilization , China , Soil mechanics
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