The Hutton tension leg platform (TLP) was installed in the North Sea in the summer of 1984. This structure was a world first in adopting the tension leg principle for a full scale floating oil production platform. The platform is held in place by 16 vertical tension legs, four at each corner, which are attached to foundation templates piled into the sea bed. The tension legs are held taut by the inherent buoyancy of the platform.This type of loading places unique conditions on the foundations as they are required to work almost exclusively in cyclic tension. As design methods were unproven for these conditions in the early 1980s, higher factors of safety were adopted in their design than would have been used for the equivalent foundation under compression. A monitoring system was installed to identify any deformations of the foundation system.This paper describes briefly the salient features of the monitoring system and summarises the data obtained between 1984 and 1991. Reference is also made to recent reanalyses of the piled foundation, which have been performed using a more advanced Effective Stress method.
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- Foundation Monitoring on the Hutton Tension Leg Platform
P. J. Stock
- Springer Netherlands
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