Evaluation of undrained failure envelopes of caisson foundations under combined loading |
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| Institution: | 1. Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire LE11 3TU, United Kingdom;2. Department of Civil Engineering, Faculty of Engineering, Islamic University in Madinah, Kingdom of Saudi Arabia;3. School of Engineering, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom;1. Department of Civil Engineering, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman, Iran;2. Department of Water Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran;1. College of Civil Engineering, Hunan University, Changsha, 410082, PR China;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;3. Centre for Offshore Foundation Systems (COFS), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;4. State Key laboratory of Subtropical Building Science, South China Institute of Geotechnical Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510640, China |
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| Abstract: | In this paper, results of a three-dimensional finite element study addressing the effect of embedment ratio (L/D) of caisson foundations on the undrained bearing capacity under uniaxial and combined loadings are discussed. The undrained response of caisson foundations under uniaxial vertical (V), horizontal (H) and moment (M) loading are investigated. A series of equations are proposed to predict the ultimate vertical, moment and maximum horizontal bearing capacity factors. The undrained response of caisson foundations under combined V-H and V-M load space is studied and presented using failure envelopes generated with side-swipe method. The kinematic mechanism accompanying failure under uniaxial loading is addressed and presented for different embedment ratios. Predictions of the uniaxial bearing capacities are compared with other models and it is confirmed that the proposed equations appropriately describe the capacity of caisson foundations under uniaxial vertical, horizontal and moment loading in homogenous undrained soils. The results of this paper can be used as a basis for standard design codes of off-shore skirted shallow foundations which will be the first of its kind. |
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| Keywords: | Bearing capacity Caisson Shallow foundation Three-dimensional finite element modelling Undrained analysis |
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