Liquefaction mitigation in silty soils using composite stone columns and dynamic compaction |
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| Authors: | Email author" target="_blank">T?ShenthanEmail author R?Nashed S?Thevanayagam G?R?Martin |
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| Institution: | 1. Department of Civil Engineering, UB, USA
2. Department of Civil Engineering,USC,Los Angeles,CA,USA |
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| Abstract: | The objective of this study is to develop an analytical methodology to evaluate the effectiveness of vibro stone column (S.C.)
and dynamic compaction (D.C.) techniques supplemented with wick drains to densify and mitigate liquefaction in saturated sands
and non-plastic silty soils. It includes the following: (i) develop numerical models to simulate and analyze soil densitication
during S.C. installation and D.C. process, and (ii) identify parameters controlling post-improvement soil density in both
cases, and (iii) develop design guidelines for densification of silty soils using the above techniques. An analytical procedure
was developed and used to simulate soil response during S.C. and D.C. installations, and the results were compared with available
case history data. Important construction design parameters and soil properties that affect the effectiveness of these techniques,
and construction design choices suitable for sands and non-plastic silty soils were identified. The methodology is expected
to advance the use of S.C. and D.C. in silty soils reducing the reliance on expensive field trials as a design tool. The ultimate
outcome of this research will be design charts and design guidelines for using composite stone columns and composite dynamic
compaction techniques in liquefaction mitigation of saturated silty soils.
Supported by: Federal Highway Administration (FHWA) Under Grant No. DTFH61-98-C-0094 |
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| Keywords: | liquefaction mitigation silty soils composite stone columns dynamic compaction |
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