Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/11833
Title: Modified residual soil for the fine-grained layer of capillary barriers
Authors: I Gbe Budi Indrawan
Keywords: DRNTU::Engineering::Civil engineering::Geotechnical
Issue Date: 2005
Source: Indrawan, I. G. B. (2005). Modified residual soil for the fine-grained layer of capillary barriers. Master’s thesis, Nanyang Technological University, Singapore.
Abstract: [THIS THESIS CONSISTS OF TWO (2) PARTS – THIS IS PART 1]. Capillary barrier, which is commonly defined as an earthen cover system consisting of a fine-grained soil overlying coarse-grained soil, has potential to be used as a slope protection technique. The contrast in hydraulic properties of the fine-grained layer and coarse-grained layer under unsaturated conditions impedes the downward water movement into the underlying protected system as demonstrated in this study. The Bukit Timah residual soil has been considered to be a suitable material for the fine-grained layer of capillary barrier system. Although residual soils are abundant in Singapore, it has high fine contents that cause the residual soil to have a low permeability and high shrinkage characteristics upon drying. In order to improve the hydraulic properties and the volumetric shrinkage characteristics, the residual soil was mixed with coarse-grained contents (i.e., gravelly sand or medium sand) or lime at different percentages. Results of the laboratory tests showed that the saturated permeabilities of the residual soil-gravelly sand mixtures and the residual soil-medium sand mixtures increased with the increase in the coarse-grained contents, while the saturated permeabilities of the residual soil-lime mixtures decreased with the increase in the lime percentages. The air-entry values of the soil-water characteristic curves (SWCCs) of the residual soil-gravelly sand mixtures and the residual soil-medium sand mixtures decreased with the increase in the coarse-grained contents and increased with the increase in the lime percentages. The permeability functions of the soil mixtures became steeper with the increase in the percentages of coarse-grained content and lime.
URI: https://hdl.handle.net/10356/11833
DOI: 10.32657/10356/11833
Rights: Nanyang Technological University
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Theses

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