Reference : The axisymetric failure mechanism of circular shallow foundations and pile foundatio...
Scientific journals : Article
Engineering, computing & technology : Civil engineering
Computational Sciences
The axisymetric failure mechanism of circular shallow foundations and pile foundations in non-cohesive soils
Van Baars, Stefan mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit >]
Computations and Materials in Civil Engineering
Golden Spiral Publishing Incorporation
Yes (verified by ORBilu)
[en] Bearing capacity ; Footings ; Foundations ; Finite Element Modelling
[en] In 1920 Prandtl published an analytical solution for the bearing capacity of a centric loaded strip footing on a weightless in-finite half-space, based on a so-called Prandtl-wedge failure mechanism. Reissner extended this solution for a surrounding surcharge and Keverling Buisman and Terzaghi for the soil weight. Meyerhof and other researchers presented correction factors for the shape of the shallow foundation, which would suggest that, the failure mechanism of circular shallow foundations, is related to the Prandtl-wedge failure mechanism. Meyerhof and Koppejan adapted this Prandtl-wedge failure mechanism also for pile foundations. The numerical calculations made in this article show that the Prandtl-wedge cannot be applied to circular shallow foundations and pile foundations in non-cohesive soils. The failure zone (plastic zone) below a loaded circular plate or pile tip, is far wider and deeper than the Prandtl-wedge. The calculations also show that there is, for these axisymmetric cases, failure both in and out of the standard x-y plane, but most of the failure is due to out-of-plane (tangential) failure. Therefore, this failure mechanism is different from the Prandtl-wedge failure mechanism. Also interesting are the circular and diagonal thin zones below the plate and around the pile tip, where there is no out-of-plane failure, although there is still in-plane failure. In these thin zones without out-of-plane failure, the tangential (out-of-plane) stresses are relatively high due to large shear strains, formed during previous shearing or sliding of the soil.
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2017 CMCE out of plane failure.pdforiginal paperPublisher postprint3.24 MBView/Open

Additional material(s):

File Commentary Size Access
Open access
Pile outofplanefailure.aviarea near pile tip without-of-plane failure4.42 MBView/Open
Open access
Pile tangential stress.aviZones of high tangential stresses near the pile tip are shear zones4.46 MBView/Open

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