Tensile strength of unsaturated coarse and fine-grained soils

Soils at the ground surface experience multiple cycles of drying and wetting. On drying, the soils experience shrinkage and cracks may appear. The development of cracks depends on the tensile strength of the soil. Such cracks increase the permeability of the soil and can cause slopes and earth struc...

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Main Authors: Bulolo, Sam, Leong, Eng Choon, Kizza, Richard
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
Subjects:
Online Access:https://hdl.handle.net/10356/155895
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1558952022-03-24T06:48:37Z Tensile strength of unsaturated coarse and fine-grained soils Bulolo, Sam Leong, Eng Choon Kizza, Richard School of Civil and Environmental Engineering Engineering::Civil engineering Tensile Strength Brazilian Test Soils at the ground surface experience multiple cycles of drying and wetting. On drying, the soils experience shrinkage and cracks may appear. The development of cracks depends on the tensile strength of the soil. Such cracks increase the permeability of the soil and can cause slopes and earth structures to fail due to rainfall. Several tensile strength models have been proposed for unsaturated soils considering the effect of matric suction. However, the tensile strength models proposed are for either cohesionless (coarse-grained) or clayey (fine-grained) soils. The tensile strength models were shown to be different in their definition of suction stress and the presence or absence of a cohesion term. As tensile strength data of fine-grained soils with the same soil structure and soil–water characteristic curve (SWCC) data are lacking in the literature, Brazilian tensile tests and SWCC tests were conducted on compacted fine-grained soils from two residual soil formations. The test data highlighted the problem in the friction angle used in existing tensile strength models. Using a general form of the suction stress and the extended Mohr–Coulomb criterion with the Brazilian test Mohr circle, a new tensile strength model applicable to both coarse-grained and fine-grained soils was proposed. The proposed model was shown to perform better than existing models using independent data. Submitted/Accepted version 2022-03-24T06:48:37Z 2022-03-24T06:48:37Z 2021 Journal Article Bulolo, S., Leong, E. C. & Kizza, R. (2021). Tensile strength of unsaturated coarse and fine-grained soils. Bulletin of Engineering Geology and the Environment, 80(3), 2727-2750. https://dx.doi.org/10.1007/s10064-020-02073-6 1435-9529 https://hdl.handle.net/10356/155895 10.1007/s10064-020-02073-6 2-s2.0-85099564596 3 80 2727 2750 en Bulletin of Engineering Geology and the Environment © 2021 Springer-Verlag GmbH Germany, part of Springer Nature. This is a post-peer-review, pre-copyedit version of an article published in Bulletin of Engineering Geology and the Environment. The final authenticated version is available online at: http://dx.doi.org/10.1007/s10064-020-02073-6. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Tensile Strength
Brazilian Test
spellingShingle Engineering::Civil engineering
Tensile Strength
Brazilian Test
Bulolo, Sam
Leong, Eng Choon
Kizza, Richard
Tensile strength of unsaturated coarse and fine-grained soils
description Soils at the ground surface experience multiple cycles of drying and wetting. On drying, the soils experience shrinkage and cracks may appear. The development of cracks depends on the tensile strength of the soil. Such cracks increase the permeability of the soil and can cause slopes and earth structures to fail due to rainfall. Several tensile strength models have been proposed for unsaturated soils considering the effect of matric suction. However, the tensile strength models proposed are for either cohesionless (coarse-grained) or clayey (fine-grained) soils. The tensile strength models were shown to be different in their definition of suction stress and the presence or absence of a cohesion term. As tensile strength data of fine-grained soils with the same soil structure and soil–water characteristic curve (SWCC) data are lacking in the literature, Brazilian tensile tests and SWCC tests were conducted on compacted fine-grained soils from two residual soil formations. The test data highlighted the problem in the friction angle used in existing tensile strength models. Using a general form of the suction stress and the extended Mohr–Coulomb criterion with the Brazilian test Mohr circle, a new tensile strength model applicable to both coarse-grained and fine-grained soils was proposed. The proposed model was shown to perform better than existing models using independent data.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Bulolo, Sam
Leong, Eng Choon
Kizza, Richard
format Article
author Bulolo, Sam
Leong, Eng Choon
Kizza, Richard
author_sort Bulolo, Sam
title Tensile strength of unsaturated coarse and fine-grained soils
title_short Tensile strength of unsaturated coarse and fine-grained soils
title_full Tensile strength of unsaturated coarse and fine-grained soils
title_fullStr Tensile strength of unsaturated coarse and fine-grained soils
title_full_unstemmed Tensile strength of unsaturated coarse and fine-grained soils
title_sort tensile strength of unsaturated coarse and fine-grained soils
publishDate 2022
url https://hdl.handle.net/10356/155895
_version_ 1728433391993356288