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Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari

Granitic residual soils are generally suitable materials for filling embankments in Malaysia due to extensive occurrence in Malaysian land. Various types of these materials from grade IV to VI have been used in embankments successfully in the past. However, they can be problematic during continuous...

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Main Author: Saffari, Pooya
Format: Book Section
Language:English
Published: Institute of Graduate Studies, UiTM 2018
Subjects:
Drugs prescribing
Drugs and their actions
Online Access:http://ir.uitm.edu.my/id/eprint/22245/1/ABS_POOYA%20SAFFARI%20TDRA%20VOL%2014%20IGS%2018.pdf
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spelling my.uitm.ir.222452019-01-15T03:13:25Z http://ir.uitm.edu.my/id/eprint/22245/ Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari Saffari, Pooya Drugs prescribing Drugs and their actions Granitic residual soils are generally suitable materials for filling embankments in Malaysia due to extensive occurrence in Malaysian land. Various types of these materials from grade IV to VI have been used in embankments successfully in the past. However, they can be problematic during continuous heavy rainfall. Infiltration of rainwater within the void spaces in unsaturated zone increases the pore water pressure and reduce the suction in the soil matrix. This can lead to a significant drop in soil shear strength especially the soil apparent cohesion as well as an increase in the bulk weight of soil mass which may cause massive settlement known as inundation settlement or wetting collapse. The same problem can occur in unsaturated granitic residual soil involves earth dams, shallow foundations, and roads. However, the conventional soils volume change models which are based on the effective stress concept for saturated soils dose not depict the volume change behaviour of unsaturated soil subjected to the wetting solely. The effect of shear strength in the interaction of effective stress is essential to be incorporated. The main aim of this study is to investigate the collapse behaviour of an unsaturated Malaysian granitic residual soil grade V subjected to loading and wetting by incorporating effective stress and shear strength. The soil was obtained from Kuala Klawang, Negeri Sembilan, Malaysia. The shear strength of the soil was characterized and the stress-strain curves were determined using consolidated drained triaxial tests conducted on both saturated and unsaturated compacted specimens. The experimental data of the saturated and unsaturated shear strength of the soil were fitted with a comprehensive constitutive shear strength model know as Curved Surface Envelope Soil Shear Strength Model that represents both linear and nonlinear shear strength behaviours with respect to suction and net stress/effective stress for unsaturated and saturated conditions. The study confirmed that the model provides the best fit for the experimental data and it is applicable for Kuala Klawang granitic residual soil grade V A suction-controlled double wall triaxial test was carried out under certain applying stress and suction to obtain the axial strain of the compacted specimen subjected to the loading and wetting. The results showed that a massive settlement around 1.92% of the initial height occurred during wetting while the soil was nearly saturated. Besides, the unsaturated collapse behaviour of Kuala Klawang granitic residual soil was simulated using the Rotational Multiple Yield Surface Framework. The model is based on the unique relationship between minimum mobilized friction angle and axial strain which incorporates the effect of shear strength into the volume change of unsaturated soils. The stressstrain response of the soil in an unsaturated condition and the axial strain during loading and wetting were predicted applying the model. The predicted results were in good agreements with experimental tests results, proving the ability of the framework in simulating and predicting the settlement of Kuala Klawang granitic residual soil grade V during compression and wetting. Institute of Graduate Studies, UiTM 2018 Book Section PeerReviewed text en http://ir.uitm.edu.my/id/eprint/22245/1/ABS_POOYA%20SAFFARI%20TDRA%20VOL%2014%20IGS%2018.pdf Saffari, Pooya (2018) Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari. In: The Doctoral Research Abstracts. IPSis Biannual Publication, 14 (14). Institute of Graduate Studies, UiTM, Shah Alam.
institution Universiti Teknologi Mara
building Tun Abdul Razak Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Mara
content_source UiTM Institutional Repository
url_provider http://ir.uitm.edu.my/
language English
topic Drugs prescribing
Drugs and their actions
spellingShingle Drugs prescribing
Drugs and their actions
Saffari, Pooya
Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari
description Granitic residual soils are generally suitable materials for filling embankments in Malaysia due to extensive occurrence in Malaysian land. Various types of these materials from grade IV to VI have been used in embankments successfully in the past. However, they can be problematic during continuous heavy rainfall. Infiltration of rainwater within the void spaces in unsaturated zone increases the pore water pressure and reduce the suction in the soil matrix. This can lead to a significant drop in soil shear strength especially the soil apparent cohesion as well as an increase in the bulk weight of soil mass which may cause massive settlement known as inundation settlement or wetting collapse. The same problem can occur in unsaturated granitic residual soil involves earth dams, shallow foundations, and roads. However, the conventional soils volume change models which are based on the effective stress concept for saturated soils dose not depict the volume change behaviour of unsaturated soil subjected to the wetting solely. The effect of shear strength in the interaction of effective stress is essential to be incorporated. The main aim of this study is to investigate the collapse behaviour of an unsaturated Malaysian granitic residual soil grade V subjected to loading and wetting by incorporating effective stress and shear strength. The soil was obtained from Kuala Klawang, Negeri Sembilan, Malaysia. The shear strength of the soil was characterized and the stress-strain curves were determined using consolidated drained triaxial tests conducted on both saturated and unsaturated compacted specimens. The experimental data of the saturated and unsaturated shear strength of the soil were fitted with a comprehensive constitutive shear strength model know as Curved Surface Envelope Soil Shear Strength Model that represents both linear and nonlinear shear strength behaviours with respect to suction and net stress/effective stress for unsaturated and saturated conditions. The study confirmed that the model provides the best fit for the experimental data and it is applicable for Kuala Klawang granitic residual soil grade V A suction-controlled double wall triaxial test was carried out under certain applying stress and suction to obtain the axial strain of the compacted specimen subjected to the loading and wetting. The results showed that a massive settlement around 1.92% of the initial height occurred during wetting while the soil was nearly saturated. Besides, the unsaturated collapse behaviour of Kuala Klawang granitic residual soil was simulated using the Rotational Multiple Yield Surface Framework. The model is based on the unique relationship between minimum mobilized friction angle and axial strain which incorporates the effect of shear strength into the volume change of unsaturated soils. The stressstrain response of the soil in an unsaturated condition and the axial strain during loading and wetting were predicted applying the model. The predicted results were in good agreements with experimental tests results, proving the ability of the framework in simulating and predicting the settlement of Kuala Klawang granitic residual soil grade V during compression and wetting.
format Book Section
author Saffari, Pooya
author_facet Saffari, Pooya
author_sort Saffari, Pooya
title Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari
title_short Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari
title_full Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari
title_fullStr Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari
title_full_unstemmed Effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / Pooya Saffari
title_sort effective stress-shear strength interaction on the collapse behaviour of unsaturated residual soil grade v / pooya saffari
publisher Institute of Graduate Studies, UiTM
publishDate 2018
url http://ir.uitm.edu.my/id/eprint/22245/1/ABS_POOYA%20SAFFARI%20TDRA%20VOL%2014%20IGS%2018.pdf
http://ir.uitm.edu.my/id/eprint/22245/
_version_ 1685649576816541696
score 13.211869

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