Capacity of Strip Foundations on Sand Overlying Clay Soils Under Planar Combined Loading
- Saeed Abyaneh (TechnipFMC) | Justin Kennedy (TechnipFMC) | Alasdair Maconochie (TechnipFMC) | John Oliphant (TechnipFMC)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- Clay, Bearing capacity, Numerical modelling, Sand, Shallow foundations, Combined loading, Rock
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- 14 since 2007
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This paper presents a numerical investigation of the capacity of strip foundations located on sand overlying clay soils under planar combined loading using the finite element method. The model is validated against available relationships for ideal cases such as uniaxial vertical capacity of strip foundations located on sand soils as well as uniaxial vertical, horizontal and moment capacity of strip foundations located on clay soils. The V-H failure envelopes of strip foundations located on either sand or clay are also found to be in good agreement with the available well-known solutions. The model is then used to investigate the uniaxial vertical capacity and combined V-H capacity of strip foundations located on sand overlying clay soils. The results are presented in the form of failure envelopes and compared with the corresponding ones for foundations located on either clay or sand. The effect of sand thickness, sand friction angle, sand dilation angle and undrained shear strength of clay on the uniaxial vertical capacity V-H capacity are then explored and discussed.
Shallow foundations are widely used to support various structures. These foundations may be subjected to combined loading resulting from submerged weight of structure, environmental conditions and operational loads. The capacity of these foundations which may be found on different soil layers can be investigated using experimental, analytical and numerical methods.
Gottardi & Butterfield (1993) investigated the bearing capacity of surface strip foundations on sand under general planar loads using a three-dimensional, small scale physical model. They proposed failure envelopes for strip foundations subjected to both inclined and eccentric loads. Gottardi et al. (1999) applied a similar approach to obtain failure envelopes for circular foundations on sand under combinations of vertical, horizontal and moment loading. Sahu et al. (2016) conducted laboratory model tests for the ultimate bearing capacity of shallow strip foundation on multi-layered geogrid-reinforced dense and loose sand subjected to centric inclined load. Based on the laboratory model test results, an empirical reduction factor was derived to estimate the ultimate inclined load.
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