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Failure mechanisms and corresponding shape factors of shallow foundations
Van Baars, Stefan
2016In Atalar (Ed.) Proceedings of 4th International Conference on New Developments in Soil Mechanics and Geotechnical Engineering
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Keywords :
Footings; Shallow Foundations; Failure Mechanism; Bearing capacity; Shape factor
Abstract :
[en] In 1920 Prandtl published an analytical solution for the bearing capacity of a maximum strip load on a weightless infinite half-space. This solution was extended by Reissner in 1924 with a surrounding surcharge. In the 1940s, Keverling Buisman and Terzaghi extended the Prandtl-Reissner formula for the soil weight. Since then several people proposed equations for the soil-weight bearing capacity factor. In 1963 Meyerhof was the first to write the formula for the (vertical) bearing capacity of shallow foundations with both inclination factors and shape factors. The failure mechanisms belonging to the cohesion bearing capacity factor and the surcharge bearing capacity factor is for an infinite (2D) strip footing a Prandtl-wedge failure mechanism, but according to Finite Element Modelling (FEM) the failure mechanism belonging to the soil-weight bearing capacity factor is not. It looks more like a global failure mechanism. This means that the assumed superposition in the Terzaghi equation, and in the Meyerhof equation, is not automatically allowed. Additional FEM calculations show that in the case of a finite strip footing, and especially of round footings, the failure mechanism is again very different, and leads to much lower shape factors as factors based on a Prandtl-wedge failure mechanism. In fact the third direction, i.e. the tangential direction, which plays no important role in the failure mechanism for infinite strip footings, starts to play a major role in the failure mechanism and in the magnitude of the bearing capacity of the strip footing
Disciplines :
Civil engineering
Author, co-author :
Van Baars, Stefan ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
External co-authors :
no
Language :
English
Title :
Failure mechanisms and corresponding shape factors of shallow foundations
Publication date :
June 2016
Event name :
Fourth International Conference on New Developments in Soil Mechanics and Geotechnical Engineering
Event organizer :
turkisch society of soil mechnics and soil mechanics and geotechnical engineering and near-east university
Event place :
Lefkosa, Cyprus
Event date :
June 2 to 4, 2016
Audience :
International
Main work title :
Proceedings of 4th International Conference on New Developments in Soil Mechanics and Geotechnical Engineering
Editor :
Atalar
Publisher :
Near East University Press, Lefkosa, Cyprus
Edition :
pp 551-558
Peer reviewed :
Peer reviewed
Available on ORBilu :
since 07 June 2016

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