Experience of Vibrocompaction in Calcareous Sand of UAE |
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Authors: | Azm S Al-Homoud W Wehr |
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Institution: | (1) American University of Sharjah, P.O. Box 26666, Sharjah, UAE;(2) Keller Grundbau Company GmbH (Offenbach), Germany |
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Abstract: | The study is concerned with the influence of various factors on vibro compaction in calcareous soils, This include effect
of carbonate content, and influence of pore water pressures in sand, settlements during vibrocompaction, vibroaccelerations
during sand column installation compared to earthquake accelerations and finally the liquefaction design based on average
CPT parameters. Previous experiences with calcareous sands and literature review confirm the necessity to apply a correlation
factor for calcareous material to the raw cone penetration resistance CPT values obtained in the field. Because of the very
fragile grains of the Dubai calcareous sands the penetration resistance will be influenced by crushing and grinding. To accommodate
for effect of calcareous sands on measured CPT values, a best fit correlations formula called here “correlation factor” is
developed. A parametric dynamic triaxial liquefaction testing programme has been executed on representative samples with loose
and dense zones. Representative testing parameters for field conditions and earthquake design accelerations have been applied
indicating that ground improvement is necessary. It was observed during the dynamic triaxial tests that the whole soil mass
consisting of dense columns and looser zones in between behaves jointly, and therefore compaction control using an average-CPT
approach is possible. |
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Keywords: | calcareous sand cone penetration test design criteria dynamic triaxial testing earthquakes liquefaction potential relative density shells correction factor UAE vibrocompaction |
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