Effect of Inter-Column Spacing on Soil Stresses due to Vibro-Installed Stone Columns: Interesting Findings |
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Authors: | Hesham Elshazly Mohamed Elkasabgy Azza Elleboudy |
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Institution: | (1) Department of Soil and Structural Dynamics, Construction Research Institute, National Water Research Center, Cairo, Egypt;(2) Dar Al-Handasah (Shair and Partners), Gulf Tower, Oud Metha Road, P.O. Box 55624, Dubai, United Arab of Emirates;(3) Department of Civil and Environmental Engineering, University of Western Ontario, London, ON, Canada;(4) Department of Civil Engineering, Faculty of Engineering, Banha University, Cairo, Egypt |
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Abstract: | This paper reveals the interesting relation between the inter-column spacing and the corresponding alteration of soil state
of stresses due to the vibro-installation technique. This relation is inferred from analyses for load settlement records of
various field load tests, performed for stone columns arrangements with different inter-column spacing values. In order to
have adequate confidence in the findings, a well-documented case history, involving three columns patterns along with their
relevant field and laboratory test results, is utilized for this study. Moreover, a well-tested finite element model, capable
of simulating both elasto-plastic and time dependent soil deformations as well as pore water pressure building and dissipation,
is employed in the analysis. Instead of determining the soil response to the test load, based on known initial soil stresses
and material properties, the analysis is inversely posed to determine the soil initial stresses, based on the recorded settlements
and the post-installation material properties. The alteration in the soil state of stress is represented by the increase in
the post-installation horizontal to vertical stress ratio, K*, as a function of the inter-column spacing. It is found that this alteration experiences a systematic decrease in its magnitude
as the inter-column spacing increases. |
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Keywords: | Back analysis Ground improvement Stone columns Soil stresses |
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