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Unified Approach to Assess Engineering Performance of Fill Improved by Shallow to Deep Compaction Based Techniques Using Relative Density

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Document pages: 12 pages

Abstract: The setting of pre assessment criteria for soil compaction is hardlydetermined, especially, in case of undecided structure locations. Differentdesign guidelines recommend achieving a specific value of relative density forthe compaction of fill placement works. Alternatives were discussed through theliterature to predict the value of relative density based on soil field tests (e.g.cone and standard penetration tests). This paper presents the weakness of usingthe Over Consolidation Ratio (OCR) as guidance to assess the value of cone tipresistance using the soil relative density. The variation of OCR (from 1 to 10)has a significant effect on the qc value up to 110 when compared to the normally consolidated state. Thennormally consolidated state can logically cover the compaction process withvariation of 20 , 33 , and 4 for relative density values 85 , 70 , and 60 ,respectively. A unified approach is recommended to predict the compaction qc-performance line usingnormally consolidated condition and sand relative density.

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