Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration

An imperative factor in rainfall induced slope failure is infiltration rate. Water that infiltrates into residual soil is predominantly controlled by two factors, i.e. rainfall intensity and saturated permeability of soil, which varies with depth as a result of weathering processes. Variation in per...

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التفاصيل البيبلوغرافية
المؤلف الرئيسي:	Abu Talib, Zaihasra
التنسيق:	أطروحة
اللغة:	English
منشور في:	2020
الموضوعات:	TA Engineering (General) Civil engineering (General)
الوصول للمادة أونلاين:	http://eprints.utm.my/id/eprint/92180/1/ZaihasraAbuTalibPSKA2019.pdf.pdf
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id	my-utm-ep.92180
record_format	uketd_dc
spelling	my-utm-ep.921802021-08-30T04:22:58Z Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration 2020 Abu Talib, Zaihasra TA Engineering (General). Civil engineering (General) An imperative factor in rainfall induced slope failure is infiltration rate. Water that infiltrates into residual soil is predominantly controlled by two factors, i.e. rainfall intensity and saturated permeability of soil, which varies with depth as a result of weathering processes. Variation in permeability may either prevent or allow water to seep into deeper soil layers. Therefore, this study aimed to investigate the behaviour of suction distribution in a two-layered residual soil system consisting of Grade V and Grade VI residual soils with various saturated permeability functions using a laboratory physical slope model, in-situ or field work, and numerical modeling. The laboratory physical slope model was developed for the purpose of facilitating infiltration tests with three different permeability functions for each of the Grade V and Grade VI soils. A total of 42 infiltration tests were performed. The twolayered slope was then numerically simulated using SEEP/W GeoStudio software, which served to verify field data and determine the best modelling scheme that later be applied to signify the suction distribution behaviour of the residual soil slope model. Burrow holes present in the Grade VI soil layer caused the loss of the capillary barrier effect, which in turn allowed more rainfall to infiltrate into the soil layers. It was also found that when the ratio of permeability function between Grade V and Grade VI soils was high, an increase in the breakthrough time with corresponding decrease in the breakthrough matric suction occurred. From the seepage analysis, the numerical model incorporating burrow holes in Grade VI residual layer coupled with the effect of two sets of relict joints in Grade V yielded significant improvement in heterogeneous residual soil slope modelling. The findings of this study were then validated with previous findings using Prediction Accuracy (PA) analysis. It was established that burrow holes and two sets of relic joints conclusively improved the modelling of heterogeneous residual soil slope particularly at depths of 1.0 m and 1.5 m. 2020 Thesis http://eprints.utm.my/id/eprint/92180/ http://eprints.utm.my/id/eprint/92180/1/ZaihasraAbuTalibPSKA2019.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:134373 phd doctoral Universiti Teknologi Malaysia Faculty of Engineering - School 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) Abu Talib, Zaihasra Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
description	An imperative factor in rainfall induced slope failure is infiltration rate. Water that infiltrates into residual soil is predominantly controlled by two factors, i.e. rainfall intensity and saturated permeability of soil, which varies with depth as a result of weathering processes. Variation in permeability may either prevent or allow water to seep into deeper soil layers. Therefore, this study aimed to investigate the behaviour of suction distribution in a two-layered residual soil system consisting of Grade V and Grade VI residual soils with various saturated permeability functions using a laboratory physical slope model, in-situ or field work, and numerical modeling. The laboratory physical slope model was developed for the purpose of facilitating infiltration tests with three different permeability functions for each of the Grade V and Grade VI soils. A total of 42 infiltration tests were performed. The twolayered slope was then numerically simulated using SEEP/W GeoStudio software, which served to verify field data and determine the best modelling scheme that later be applied to signify the suction distribution behaviour of the residual soil slope model. Burrow holes present in the Grade VI soil layer caused the loss of the capillary barrier effect, which in turn allowed more rainfall to infiltrate into the soil layers. It was also found that when the ratio of permeability function between Grade V and Grade VI soils was high, an increase in the breakthrough time with corresponding decrease in the breakthrough matric suction occurred. From the seepage analysis, the numerical model incorporating burrow holes in Grade VI residual layer coupled with the effect of two sets of relict joints in Grade V yielded significant improvement in heterogeneous residual soil slope modelling. The findings of this study were then validated with previous findings using Prediction Accuracy (PA) analysis. It was established that burrow holes and two sets of relic joints conclusively improved the modelling of heterogeneous residual soil slope particularly at depths of 1.0 m and 1.5 m.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abu Talib, Zaihasra
author_facet	Abu Talib, Zaihasra
author_sort	Abu Talib, Zaihasra
title	Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
title_short	Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
title_full	Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
title_fullStr	Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
title_full_unstemmed	Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
title_sort	flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Engineering - School of Civil Engineering
publishDate	2020
url	http://eprints.utm.my/id/eprint/92180/1/ZaihasraAbuTalibPSKA2019.pdf.pdf
_version_	1747818575012298752

Flow mechanism and suction distribution in heteregenous residual soil slope under rainfall infiltration

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