Abstract
The setting of pre assessment criteria for soil compaction is hardly determined, especially, in case of undecided structure locations. Different design guidelines recommend achieving a specific value of relative density for the compaction of fill placement works. Alternatives were discussed through the literature 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 using the Over Consolidation Ratio (OCR) as guidance to assess the value of cone tip resistance 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. Then normally consolidated state can logically cover the compaction process with variation 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 using normally consolidated condition and sand relative density.
Highlights
In recent years, the field of construction has witnessed a great leap in building technologies with targeting a maximum cost saving
This paper presents the weakness of using the Over Consolidation Ratio (OCR) as guidance to assess the value of cone tip resistance using the soil relative density
The soil parameters to be utilized within the basic correlations of cone resistance and relative density is the analysis objective of this paper and whether Normally Consolidated (NC) or Over Consolidated (OC) concepts are applicable for the cases of densifying shallow soil formations
Summary
For these cases, deep foundations (e.g. piles) are used to cope with the super-structure loads. The design criteria for soil-treatment/fill-compaction may be unknown, especially, at the tender or site preparation stages in addition to undecided structures locations. The underneath soil/fill performance needs to be assessed prior to start the treatment process to determine the type and the depth of ground modifications. This paper presents the weakness of using the Over Consolidation Ratio (OCR) as guidance to assess the value of cone tip resistance using the soil relative density. A unified approach is recommended to predict the compaction qc-performance line using normally consolidated condition and sand relative density
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