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Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer

Calculation of the ultimate bearing capacity of shallow footing on a two layered system of soil depends on the pattern of the failure surface that develops below the footing. For a weak clay layer overlaid by a top dense sand layer, previous studies assumed that the failure surface is a punching...

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Main Authors: Al-Shenawy, Abdulhafiz O., Al-Karni, Awad A.
Format: Article
Language:English
English
Published: Universiti Putra Malaysia Press 2005
Online Access:http://psasir.upm.edu.my/id/eprint/3865/1/Pages_from_JST_VOL._13_NO._2-6.pdf
http://psasir.upm.edu.my/id/eprint/3865/
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spelling my.upm.eprints.38652013-05-27T07:11:52Z http://psasir.upm.edu.my/id/eprint/3865/ Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer Al-Shenawy, Abdulhafiz O. Al-Karni, Awad A. Calculation of the ultimate bearing capacity of shallow footing on a two layered system of soil depends on the pattern of the failure surface that develops below the footing. For a weak clay layer overlaid by a top dense sand layer, previous studies assumed that the failure surface is a punching shear failure through the upper sand layer and Prandtl's failure mode in the bottom weak clay layer. By adapting this assumption in this study, the ultimate bearing capacity equation was derived as a function of the properties of soils, the footing width, and the topsoil thickness. The paper presents a detailed parametric study of the design parameters including the effect of angle of friction, the ratio of the thickness of sand layer to the footing width, the ratio of the depth of embedment to the footing width, and the ratio of the clay soil cohesion to the product of the clay unit weight by the footing width. Design charts were developed in dimensionless form for very wide ranges of design parameters. The available method based on the limit equalibrium analysis was developed in dimensionlised form and for a limited range of design parametrs. The new charts give another option for those who believe that the design charts developed based on the upper limit analysis overestimate the bearing capacity due to the very nature of the upper bound solution. The new design charts are limited to shallow footings. Universiti Putra Malaysia Press 2005 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/3865/1/Pages_from_JST_VOL._13_NO._2-6.pdf Al-Shenawy, Abdulhafiz O. and Al-Karni, Awad A. (2005) Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer. Pertanika Journal of Science & Technology, 13 (2). pp. 213-235. ISSN 0128-7680 English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description Calculation of the ultimate bearing capacity of shallow footing on a two layered system of soil depends on the pattern of the failure surface that develops below the footing. For a weak clay layer overlaid by a top dense sand layer, previous studies assumed that the failure surface is a punching shear failure through the upper sand layer and Prandtl's failure mode in the bottom weak clay layer. By adapting this assumption in this study, the ultimate bearing capacity equation was derived as a function of the properties of soils, the footing width, and the topsoil thickness. The paper presents a detailed parametric study of the design parameters including the effect of angle of friction, the ratio of the thickness of sand layer to the footing width, the ratio of the depth of embedment to the footing width, and the ratio of the clay soil cohesion to the product of the clay unit weight by the footing width. Design charts were developed in dimensionless form for very wide ranges of design parameters. The available method based on the limit equalibrium analysis was developed in dimensionlised form and for a limited range of design parametrs. The new charts give another option for those who believe that the design charts developed based on the upper limit analysis overestimate the bearing capacity due to the very nature of the upper bound solution. The new design charts are limited to shallow footings.
format Article
author Al-Shenawy, Abdulhafiz O.
Al-Karni, Awad A.
spellingShingle Al-Shenawy, Abdulhafiz O.
Al-Karni, Awad A.
Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer
author_facet Al-Shenawy, Abdulhafiz O.
Al-Karni, Awad A.
author_sort Al-Shenawy, Abdulhafiz O.
title Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer
title_short Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer
title_full Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer
title_fullStr Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer
title_full_unstemmed Derivation of Bearing Capacity Equation for a Two Layered System of Weak Clay Layer Overlaid by Dense Sand Layer
title_sort derivation of bearing capacity equation for a two layered system of weak clay layer overlaid by dense sand layer
publisher Universiti Putra Malaysia Press
publishDate 2005
url http://psasir.upm.edu.my/id/eprint/3865/1/Pages_from_JST_VOL._13_NO._2-6.pdf
http://psasir.upm.edu.my/id/eprint/3865/
_version_ 1643822736573726720
score 13.211869

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