Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics

Hydraulic anisotropy of a soil represents a directional dependence of its permeability. Past research on hydraulic anisotropy under unsaturated condition were mainly limited to the extent of theoretical concept. The available experimental results in literature focused only on one particular soil mix...

Full description

Bibliographic Details
Main Author: Janiardy, Kevin
Other Authors: Harianto Rahardjo
Format: Final Year Project (FYP)
Language:English
Published: 2017
Subjects:
Online Access:http://hdl.handle.net/10356/71838
_version_ 1826113718563373056
author Janiardy, Kevin
author2 Harianto Rahardjo
author_facet Harianto Rahardjo
Janiardy, Kevin
author_sort Janiardy, Kevin
collection NTU
description Hydraulic anisotropy of a soil represents a directional dependence of its permeability. Past research on hydraulic anisotropy under unsaturated condition were mainly limited to the extent of theoretical concept. The available experimental results in literature focused only on one particular soil mixture, i.e. 50% sand and 50% kaolin. This project advanced the experimental study of those literatures. It aimed to understand the hydraulic anisotropy characteristics of unsaturated soils with unimodal and bimodal characteristics and to examine its relationship with fines content. Laboratory experiments comprising index soil properties, soil-water characteristic curve (SWCC), and saturated and unsaturated permeability tests of compacted soil made of 30% sand and 70% kaolin were carried out. Experimental results indicated that at a given composition, soil with unimodal SWCC (compacted at wet of optimum) has a higher hydraulic anisotropy as compared to soil with bimodal SWCC (compacted at dry of optimum). Hydraulic anisotropy of soil became less prominent with the increase in fines content and the decrease in dry density. Furthermore, hydraulic anisotropy in the unsaturated condition exhibited similar values to that in the saturated condition, regardless of its initial compaction conditions. In addition, evaluation towards statistical model to estimate unsaturated permeability substantiated the applicability of the estimation to indirectly determine hydraulic anisotropy of soil with unimodal and bimodal SWCCs.
first_indexed 2024-10-01T03:27:48Z
format Final Year Project (FYP)
id ntu-10356/71838
institution Nanyang Technological University
language English
last_indexed 2024-10-01T03:27:48Z
publishDate 2017
record_format dspace
spelling ntu-10356/718382023-03-03T16:53:14Z Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics Janiardy, Kevin Harianto Rahardjo School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Geotechnical Hydraulic anisotropy of a soil represents a directional dependence of its permeability. Past research on hydraulic anisotropy under unsaturated condition were mainly limited to the extent of theoretical concept. The available experimental results in literature focused only on one particular soil mixture, i.e. 50% sand and 50% kaolin. This project advanced the experimental study of those literatures. It aimed to understand the hydraulic anisotropy characteristics of unsaturated soils with unimodal and bimodal characteristics and to examine its relationship with fines content. Laboratory experiments comprising index soil properties, soil-water characteristic curve (SWCC), and saturated and unsaturated permeability tests of compacted soil made of 30% sand and 70% kaolin were carried out. Experimental results indicated that at a given composition, soil with unimodal SWCC (compacted at wet of optimum) has a higher hydraulic anisotropy as compared to soil with bimodal SWCC (compacted at dry of optimum). Hydraulic anisotropy of soil became less prominent with the increase in fines content and the decrease in dry density. Furthermore, hydraulic anisotropy in the unsaturated condition exhibited similar values to that in the saturated condition, regardless of its initial compaction conditions. In addition, evaluation towards statistical model to estimate unsaturated permeability substantiated the applicability of the estimation to indirectly determine hydraulic anisotropy of soil with unimodal and bimodal SWCCs. Bachelor of Engineering (Civil) 2017-05-19T05:53:54Z 2017-05-19T05:53:54Z 2017 Final Year Project (FYP) http://hdl.handle.net/10356/71838 en Nanyang Technological University 62 p. application/pdf
spellingShingle DRNTU::Engineering::Civil engineering::Geotechnical
Janiardy, Kevin
Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
title Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
title_full Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
title_fullStr Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
title_full_unstemmed Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
title_short Hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
title_sort hydraulic anisotropy of unsaturated soils with unimodal and bimodal characteristics
topic DRNTU::Engineering::Civil engineering::Geotechnical
url http://hdl.handle.net/10356/71838
work_keys_str_mv AT janiardykevin hydraulicanisotropyofunsaturatedsoilswithunimodalandbimodalcharacteristics