Frontiers in Offshore Geotechnics II by Susan Gourvenec, David White

By Susan Gourvenec, David White

Frontiers in Offshore Geotechnics II includes the court cases of the second one overseas Symposium on Frontiers in Offshore Geotechnics (ISFOG), organised through the Centre for Offshore starting place structures (COFS) and held on the collage of Western Australia (UWA), Perth from eight – 10 November 2010. the amount addresses present and rising demanding situations dealing with these operating in offshore geotechnics, spanning building, layout and learn. Keynote papers with authors from and academia describe the cutting-edge of perform and thought. one other 117 peer-reviewed papers describe rising learn, new layout strategies and up to date case stories relating to the frontiers of offshore geotechnical engineering. the topics of the papers comprise geohazards, fuel hydrates, in situ website characterisation and pore strain dimension, website research, soil characterisation, foundations for renewable power, shallow foundations, jack-up devices, piled foundations, anchoring structures, pipelines and hazard and reliability. New and validated layout equipment representing most sensible perform are mentioned along new development applied sciences and rising examine rules. Frontiers in Offshore Geotechnics II presents a accomplished state of the art reference for pros and researchers in offshore, civil and maritime engineering and for soil mechanics specialists.

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These developments have been achieved with the encouragement and support of one or more operators. Guidelines and Standards. Currently, there is a lack of international guidelines and standards for the performance of marine geophysical and geotechnical investigations, including vessel and equipment audits and best practices for data acquisition, laboratory testing and reporting. As a consequence operators often produce diverse job specifications that may have led to global inconsistencies and inefficiency, especially in the geotechnical investigation contracting business.

However, the responsibility for geotechnical risks is not always clear, even in so-called non-geohazardous areas. For example, unproven, often bespoke, designs naturally carry greater than normal construction and operational risks for operators and their contractors. These risks increase for EPC contractors when they are required to adopt or adapt research-based design methods that are the intellectual properties of operators or niche specialists. In the short term, these additional risks are likely to be reflected in bid prices and in the numbers of contractual exclusions and claims but in time it is hoped that the new methods will be tested and calibrated by field monitoring and will evolve in to more reliable and routine solutions that attract less uncertainty and risks.

Numerical methods based on finite elements have been shown to be useful for improving fundamental understanding of soil structure interactions but are difficult to adapt for routine design and, according to Randolph et al. (2005), may also be unconservative in some cases. ISO 19901-4 recommends the use of large scale load tests, model tests and field instrumentation to reduce residual uncertainties with foundation behaviour. Geotechnical engineering in geohazard-prone areas is potentially even more challenging due to more complex geology and greater natural soil variability that increases the ‘aleatory’ design uncertainties, Jeanjean et al.

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