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Title: | COMPRESSIBILITY OF EXCAVATED AND DREDGED MATERIALS | Authors: | NICOLAS GABRIEL LEE LIN HAO | Keywords: | oedometer, clay, compressibility, creep, overconsolidation, unload-reload | Issue Date: | 4-Aug-2022 | Citation: | NICOLAS GABRIEL LEE LIN HAO (2022-08-04). COMPRESSIBILITY OF EXCAVATED AND DREDGED MATERIALS. ScholarBank@NUS Repository. | Abstract: | The inclusion of fine-grained soils in reclamation fill presents greater concerns towards long-term creep settlement. This is often improved through surcharge-induced overconsolidation, largely correlated with the OCR parameter. However, OCR alone does not account for the magnitude of the maximum and minimum stresses in the unload-reload cycle, which have been observed to affect primary compression. Understanding the interrelationship between primary and secondary compressibility suggests a corresponding influence on creep improvement. Oedometer tests conducted on a reconstituted clayey soil suggested that an increase in σ’v,max and σ’v,max/σ’v,min each result in less creep reduction at a given OCR, owing to stiffness degradation along the reloading path. Two unique Cα’/Cr values were observed depending on the number of reloading steps. When a single step was applied from unloading, relatively higher Cα’/Cr values were consistently observed. Once preceding reloading steps were introduced, Cα’/Cr was consistent with the Cα/Cc ratio measured in virgin compression. | URI: | https://scholarbank.nus.edu.sg/handle/10635/237659 |
Appears in Collections: | Master's Theses (Open) |
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NL MEng Thesis - Final - Amended 08.01.23.pdf | 1.45 MB | Adobe PDF | OPEN | None | View/Download |
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