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An investigation of correlation factors linking footing resistance on sand with cone penetration test results
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File | Description | Size | Format | |
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AN INVESTIGATION OF CORRELATION FACTORS LINKING FOOTING RESISTANCE ON SAND WITH CONE PENETRATION TEST RESULTS.pdf | 1.28 MB |
Author(s)
Date Issued
November 2012
Date Available
20T11:58:11Z February 2013
Abstract
Significant research effort has led to improvements in our ability to estimate the ultimate
bearing resistance of footings in sand. These techniques often estimate the footing
resistance at relatively large displacements, typically 10% of the footing width, qb0.1.
Cone Penetration Test (CPT) design methods typically link qb0.1 and qc through a constant reduction factor, a. A range of a factors for shallow footings have been proposed, some methods suggest that a is constant and while others that it varies with footing width and depth (or stress level). There is a dearth of field data with which to compare these correlation factors, in particular where foundation width and depth have been varied in the same ground conditions. For this reason finite element analyses have proven to be a useful tool for performing the parametric studies required to asses factors controlling a. This paper describes the results of numerical analyses performed to investigate a factors for soil profiles which were calibrated using the results of the CPT tests performed at a dense sand test-bed site. The numerical model was first used to perform parametric 2 analyses to consider the effect of footing width, B and footing depth, D on the a factor mobilised in dense Blessington sand. In order to assess the effects of relative density, footing tests in a range of natural sands with variable in-situ densities were modeled. The results of the finite element analyses suggest that a direct correlation between qb0.1 and qc can be established at a given test site which is independent of footing width and depth and is relatively weakly dependent on the sands relative density if the zone of influence of the foundation considered is large enough.
Type of Material
Journal Article
Publisher
Elsevier
Journal
Computers and Geotechnics
Volume
46
Start Page
84
End Page
92
Copyright (Published Version)
2012 Elsevier Ltd
Language
English
Status of Item
Peer reviewed
ISSN
0266352X
This item is made available under a Creative Commons License
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