The Yolla A Platform incorporates a new foundation concept, defined as an un-ballasted raft foundation, and was successfully installed in the Bass Strait of Australia in 2004. Soil conditions at the site comprise a complex sequence of normally consolidated calcareous silt, calcareous sand and calcareous clay, and required extensive soil interpretation to support the design process. The foundation is subject to extreme combinations of environmental loading and was designed using a combination of analytical and numerical design tools. Soil preloading using underbase suction was incorporated in the design to facilitate increases in foundation capacity and to limit post installation long term foundation displacements. Skirt penetration and subsequent suction preloading were issues requiring close attention during detailed design, as well as extensive monitoring and interpretation both during and after installation. This paper presents a general overview of the design and installation processes, and includes a summary of observations made during foundation installation.
|Title of host publication||Proceedings of the 6th International Offshore Site Investigation and Geotechnics Conference: Confronting New Challenges and Sharing Knowledge|
|Place of Publication||London|
|Publisher||Society for Underwater Technology|
|Number of pages||14|
|ISBN (Print)||978 0 906940 49 5|
|Publication status||Published - 2007|
|Event||6th International Conference on Offshore Site Investigation and Geotechnics - London, United Kingdom|
Duration: 11 Sep 2007 → 13 Sep 2007
|Conference||6th International Conference on Offshore Site Investigation and Geotechnics|
|Period||11/09/07 → 13/09/07|
Watson, P. G., & Humpheson, C. (2007). Foundation design and installation of the Yolla A Platform. In Proceedings of the 6th International Offshore Site Investigation and Geotechnics Conference: Confronting New Challenges and Sharing Knowledge (pp. 399-412). London: Society for Underwater Technology.