Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri

Soil in the field is subjected to variations in the water content due to water infiltration and evaporation processes that put the soil under either drying or wetting conditions. The shear strength of soil is affected by hydraulic hysteresis (the difference between drying and wetting). Defining the...

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Main Author:	Jaafar Albadri, Wael Mahmood
Format:	Thesis
Language:	English
Published:	2019
Subjects:	TC Hydraulic engineering Ocean engineering
Online Access:	https://ir.uitm.edu.my/id/eprint/82274/1/82274.pdf
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id	my-uitm-ir.82274
record_format	uketd_dc
spelling	my-uitm-ir.822742024-05-03T03:36:00Z Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri 2019 Jaafar Albadri, Wael Mahmood TC Hydraulic engineering. Ocean engineering Soil in the field is subjected to variations in the water content due to water infiltration and evaporation processes that put the soil under either drying or wetting conditions. The shear strength of soil is affected by hydraulic hysteresis (the difference between drying and wetting). Defining the shear strength of unsaturated soil based on the two independent stress state variables approach was under argument by other researchers since the mentioned approach is not incorporating the variation of degree of saturation under given suction caused by the hydraulic hysteresis. In this research, the suction controlled triaxial test was used to conduct experiments on sand under different hydraulic phases (first drying, first wetting and second wetting). On top of that, the pressure plate extractor was modified to measure the wetting portion of SWCC. According to the test results, it was found that hydraulic hysteresis reduces with increasing the confining pressure and with increasing the drying-wetting cycles. Moreover, Although the maximum shear strength was obtained from the specimens under drying condition, the difference between the drying and wetting shear strengths was not significant for the tested soil. Also, the shear strength of unsaturated sand at any suction below the air entry value is equivalent to the saturated shear strength. The SWCC was found to be capable of not only estimating unsaturated soil property functions but also anticipating the shear strength behaviour of soil under different hydraulic phases. Based on the strong correlation between the SWCC and the apparent shear strength, this research has developed a shear strength model that incorporate the effect of hydraulic hysteresis and the alternate D-W cycles. The model was successfully validated by using experimental results from previous studies. 2019 Thesis https://ir.uitm.edu.my/id/eprint/82274/ https://ir.uitm.edu.my/id/eprint/82274/1/82274.pdf text en public phd doctoral Universiti Teknologi MARA (UiTM) Faculty of Civil Engineering Md Noor, Mohd Jamaludin
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
advisor	Md Noor, Mohd Jamaludin
topic	TC Hydraulic engineering Ocean engineering
spellingShingle	TC Hydraulic engineering Ocean engineering Jaafar Albadri, Wael Mahmood Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri
description	Soil in the field is subjected to variations in the water content due to water infiltration and evaporation processes that put the soil under either drying or wetting conditions. The shear strength of soil is affected by hydraulic hysteresis (the difference between drying and wetting). Defining the shear strength of unsaturated soil based on the two independent stress state variables approach was under argument by other researchers since the mentioned approach is not incorporating the variation of degree of saturation under given suction caused by the hydraulic hysteresis. In this research, the suction controlled triaxial test was used to conduct experiments on sand under different hydraulic phases (first drying, first wetting and second wetting). On top of that, the pressure plate extractor was modified to measure the wetting portion of SWCC. According to the test results, it was found that hydraulic hysteresis reduces with increasing the confining pressure and with increasing the drying-wetting cycles. Moreover, Although the maximum shear strength was obtained from the specimens under drying condition, the difference between the drying and wetting shear strengths was not significant for the tested soil. Also, the shear strength of unsaturated sand at any suction below the air entry value is equivalent to the saturated shear strength. The SWCC was found to be capable of not only estimating unsaturated soil property functions but also anticipating the shear strength behaviour of soil under different hydraulic phases. Based on the strong correlation between the SWCC and the apparent shear strength, this research has developed a shear strength model that incorporate the effect of hydraulic hysteresis and the alternate D-W cycles. The model was successfully validated by using experimental results from previous studies.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Jaafar Albadri, Wael Mahmood
author_facet	Jaafar Albadri, Wael Mahmood
author_sort	Jaafar Albadri, Wael Mahmood
title	Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri
title_short	Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri
title_full	Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri
title_fullStr	Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri
title_full_unstemmed	Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri
title_sort	effect of hydraulic hysteresis on shear strength of unsaturated sand / wael mahmood jaafar albadri
granting_institution	Universiti Teknologi MARA (UiTM)
granting_department	Faculty of Civil Engineering
publishDate	2019
url	https://ir.uitm.edu.my/id/eprint/82274/1/82274.pdf
_version_	1804889706731667456

Effect of hydraulic hysteresis on shear strength of unsaturated sand / Wael Mahmood Jaafar Albadri

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