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Peak punch-through capacity of spudcan in sand with interbedded clay: Numerical and analytical modelling

journal contribution
posted on 09.02.2018, 00:00 authored by Shah Neyamat UllahShah Neyamat Ullah, Y Hu
© 2017, Canadian Science Publishing. All rights reserved. The presence of a thin soft clay layer inside a bed of sand may significantly reduce the bearing capacity of the sand layer, imposing a risk of punch-through failure. In this paper, finite element (FE) simulations are reported using a hardening soil (HS) model for sand. The FE model has been verified against centrifuge tests involving loose and dense sand layers overlying clay soil. The effects of sand stiffness, foundation roughness, sand friction angle, undrained clay strength, clay strength nonhomogeneity, and sand and clay layer geometries on the foundation peak capacities have been studied. Punch-through failure is initiated with an inclined sand plug being sheared and pushed into the underlying soft clay. During punch-through, the clay layer fails due to significant radial squeezing. Existing analytical models do not capture the combined failure mechanism of sand shearing and clay radial squeezing. A new analytical model is developed to estimate the peak punch-through capacity of a spudcan in sand with an interbedded clay layer, showing improved performance over the current industry guidelines.

History

Volume

54

Issue

8

Start Page

1071

End Page

1088

Number of Pages

18

eISSN

1208-6010

ISSN

0008-3674

Additional Rights

Open access only for the Toronto library copy.

Peer Reviewed

Yes

Open Access

No

Acceptance Date

12/02/2017

Era Eligible

Yes

Journal

Canadian Geotechnical Journal