Nonlinear Cone Penetration Test-Based Method for Predicting Footing Settlements on Sand |
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Authors: | C. D. O’Loughlin B. M. Lehane |
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Affiliation: | 1Lecturer, School of Engineering, Institute of Technology Sligo, Ireland (corresponding author); formerly, Centre for Offshore Foundation Systems, The Univ. of Western Australia. E-mail: oloughlin.conleth@itsligo.ie 2Professor, School of Civil and Resource Engineering, The Univ. of Western Australia, 35 Stirling Hwy, Crawley, Western Australia 6009, Australia. E-mail: lehane@civil.uwa.edu.au
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Abstract: | This paper presents centrifuge data from model footing tests on dry sand, where a high resolution optical displacement measurement technique was employed to record subsurface soil displacements beneath the centerline of loaded strip footings. These measurements allow derivation of vertical strain profiles, which are then used to estimate operational soil stiffness values. The stiffness values, which were assessed assuming a dependence on cone penetration test tip resistance and initial vertical effective stress level, are shown to degrade rapidly with increasing strain level. Despite such nonlinearity, the experimental strain data can be represented using an updated form of the well known Schmertmann strain influence profile. Settlements calculated using this profile are shown to be in agreement with subsurface settlements when appropriate soil stiffness values are employed. |
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Keywords: | Stiffness Footings Foundation settlement Centrifuge models Sand, Soil type Cone penetration test |
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