Soil moisture variation due to grass water uptake in shallow slope

Shallow landslide is the slope failure phenomenon that frequently occurs in tropical rainforest region such as Malaysia. While fine root distribution for grass with depth is consistent and easily defined, the fine root network plays an important role as geosynthetic mesh by providing apparent enhanc...

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Main Author:	Ismail, Siti Saidatul Azween
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/53569/1/SitiSaidatulAzweenMFKA2015.pdf
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id	my-utm-ep.53569
record_format	uketd_dc
spelling	my-utm-ep.535692020-07-21T01:22:50Z Soil moisture variation due to grass water uptake in shallow slope 2015-06 Ismail, Siti Saidatul Azween TA Engineering (General). Civil engineering (General) Shallow landslide is the slope failure phenomenon that frequently occurs in tropical rainforest region such as Malaysia. While fine root distribution for grass with depth is consistent and easily defined, the fine root network plays an important role as geosynthetic mesh by providing apparent enhanced cohesion that increases the strength of the soil. This study is aimed to evaluate the effects of grass on shallow slope stability in terms of soil moisture variation and to develop 1D soil moisture suction due to grass water uptake. The numerical simulation modelling was applied based on the literature review results to obtain the most appropriate condition to replicate the grass water uptake within the soil slope. The transpiration was solely based on six types of grass which have significantly altered the matric suction or moisture variation distribution on an unsaturated soil slope. The types of grass were Axonopus Compressus, Pennisetum Purpureum, Andropogon Gayanus, Brachiaria Humidicola, Melinis Minutiflora and Digitaria Eriantha. The assessment of slope stability due to the influence of six type of grasses induced suction was provided in this research. The length of grass roots are different for all grasses, ranging from 0.3048 m up to 4.000 m. Results of safety factor demonstrated that shallow slope stability is sensitive to pressure head. The factors of safety for all grasses are ranging from 2.8800 until 3.1860. A value which is greater than 1 represents the stability of the slope. This research delivers a strongly belief that Axonopus Compressus grass absorb water way faster from others with factor of safety of 3.0670 and is beneficial in maintaining stability of unsaturated soil. 2015-06 Thesis http://eprints.utm.my/id/eprint/53569/ http://eprints.utm.my/id/eprint/53569/1/SitiSaidatulAzweenMFKA2015.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85155 masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Ismail, Siti Saidatul Azween Soil moisture variation due to grass water uptake in shallow slope
description	Shallow landslide is the slope failure phenomenon that frequently occurs in tropical rainforest region such as Malaysia. While fine root distribution for grass with depth is consistent and easily defined, the fine root network plays an important role as geosynthetic mesh by providing apparent enhanced cohesion that increases the strength of the soil. This study is aimed to evaluate the effects of grass on shallow slope stability in terms of soil moisture variation and to develop 1D soil moisture suction due to grass water uptake. The numerical simulation modelling was applied based on the literature review results to obtain the most appropriate condition to replicate the grass water uptake within the soil slope. The transpiration was solely based on six types of grass which have significantly altered the matric suction or moisture variation distribution on an unsaturated soil slope. The types of grass were Axonopus Compressus, Pennisetum Purpureum, Andropogon Gayanus, Brachiaria Humidicola, Melinis Minutiflora and Digitaria Eriantha. The assessment of slope stability due to the influence of six type of grasses induced suction was provided in this research. The length of grass roots are different for all grasses, ranging from 0.3048 m up to 4.000 m. Results of safety factor demonstrated that shallow slope stability is sensitive to pressure head. The factors of safety for all grasses are ranging from 2.8800 until 3.1860. A value which is greater than 1 represents the stability of the slope. This research delivers a strongly belief that Axonopus Compressus grass absorb water way faster from others with factor of safety of 3.0670 and is beneficial in maintaining stability of unsaturated soil.
format	Thesis
qualification_level	Master's degree
author	Ismail, Siti Saidatul Azween
author_facet	Ismail, Siti Saidatul Azween
author_sort	Ismail, Siti Saidatul Azween
title	Soil moisture variation due to grass water uptake in shallow slope
title_short	Soil moisture variation due to grass water uptake in shallow slope
title_full	Soil moisture variation due to grass water uptake in shallow slope
title_fullStr	Soil moisture variation due to grass water uptake in shallow slope
title_full_unstemmed	Soil moisture variation due to grass water uptake in shallow slope
title_sort	soil moisture variation due to grass water uptake in shallow slope
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2015
url	http://eprints.utm.my/id/eprint/53569/1/SitiSaidatulAzweenMFKA2015.pdf
_version_	1747817583962226688

Soil moisture variation due to grass water uptake in shallow slope

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