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Cyclic Laboratory Testing of Chalk to Improve the Reliability of Piled Foundation Design

Author(s)
D.L. Coyne, M. Rattley, P. Houlston, I. Alobaidi, A. Benson & C. Russell,
Abstract
The demand for economic and reliable foundations in offshore renewable developments has resulted in a need to more accurately understand the behaviour of piled foundations subject to cyclic loading. Currently little information is published on the effect of cyclic loading on piled foundations in chalk. It is believed cyclic loading can cause degradation of the chalk strength and thus of ultimate pile capacity as a result. Generally, conservative designs are adopted to mitigate against the potential risks. This paper investigates the cyclic damage threshold of chalk strata regularly encountered in the North Sea by using cyclic triaxial and simple shear tests on chalk and specifically designed chalk-grout interface simple shear laboratory tests. Improved foundation design recommendations are provided as a result of the laboratory investigation.
 
Keywords
Russell Geotechnical Innovations RGI Fugro ISFOG Laboratory Testing Structureless Chalk Cyclic Loading Monotonic Loading Offshore Geotechnics Site Investigation Marine Soil Investigation Piled Foundations CIRIA C574 Cyclic Testing Triaxial Direct Simple Shear DSS Cyclic Direct Simple Shear CSS North Sea
 
Reference
Coyne, D.L. & Rattley, M & Houlston, P & Alobaidi, Imad & Benson, A & Russell, C. (2015). Cyclic Laboratory Testing of Chalk to Improve the Reliability of Piled Foundation Design. Frontiers in Offshore Geotechnics III - 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015. 1185-1190. 10.1201/b18442-178.