American Society of Civil Engineers


Undrained Bearing Capacity of Deeply Buried Flat Circular Footings under General Loading


by Youhu Zhang, (corresponding author), (Ph.D. Candidate, Centre for Offshore Foundation Systems M053, Univ. of Western Australia, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia. E-mail: yzhang@civil.uwa.edu.au), Britta Bienen, (Associate Professor, Centre for Offshore Foundation Systems M053, Univ. of Western Australia, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia.), Mark J. Cassidy, (Winthrop Professor, Centre for Offshore Foundation M053 Systems, Univ. of Western Australia, 35 Stirling Highway, Crawley, Perth, WA 6009, Australia.), and Susan Gourvenec, (Professor, Centre for Offshore Foundation Systems M053, Univ. of Western Australia, 35 Stirling Highway, Crawley, Perth WA 6009, Australia.)

Journal of Geotechnical and Geoenvironmental Engineering, Vol. 138, No. 3, March 2012, pp. 385-397, (doi:  http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0000606)

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Document type: Journal Paper
Abstract: Estimation of a footing’s bearing capacity under general loading is a topic of wide interest, especially for the offshore energy industry. Although there have been several studies in the past few decades on shallow footings under general loading, limited work has been done for deeply buried footings. This paper presents results of a numerical investigation into the undrained bearing capacity of deeply buried flat circular footings in clay of both uniform and linearly increasing shear strength profiles. The footings’ uniaxial bearing capacities and failure surfaces under combined vertical, horizontal, and moment loading are reported. The results are analyzed in the context of application by the mobile jack-up industry, for which understanding of the circular spudcan footing’s bearing capacity under general loading is required for site-specific assessments. The paper also presents a parametric study on the effect of a footing’s aspect ratio (thickness/diameter) on its bearing capacity. To conclude, a closed-form expression is proposed to formulate the failure surfaces of the footings under general loading.


ASCE Subject Headings:
Footings
Numerical models
Offshore structures
Load bearing capacity
Clays

Author Keywords:
Footings
Numerical modeling
Offshore engineering
Bearing capacity
Combined loading
Clays