SYMPOSIA PAPER Published: 01 January 1985
STP36344S

Effects of Sustained Shear Stresses on the Cyclic Degradation of Clay

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The soils surrounding any of the anchorage piles of a tension leg platform (TLP) will be subjected to average (sustained) shear stresses τave of significant magnitude, in addition to the cyclic shear stresses τc associated with fluctuations of environmental loading. In order to investigate their combined effect on the displacement behavior of such a foundation, ten cyclic direct simple shear (DSS) tests were run with constant values of both τave and τc, as were two tests with variable τc. All the conditions of the 1975 Norwegian Geotechnical Institute (NGI) program (Andersen 1976 and Andersen et al, 1980) were followed (Plastic Drammen Clay, Geonor DSS device, and so forth) in order to capitalize upon, and increase, that data base.

The results of the investigation are presented in the form of “three-dimensional strain contour diagrams,” which improve our ability to interpolate, and even extrapolate, the data over a wide range of stress conditions. Furthermore, a procedure is proposed that permits a satisfactory estimation of the clay behavior under the variable cyclic loading imposed.

Author Information

Goulois, AM
Société Nationale Elf Aquitaine (Production), Pau Cedex, France
Whitman, RV
MIT, Cambridge, MA
Hoeg, K
Norwegian Geotechnical Institute, Oslo, Norway
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Details
Developed by Committee: D18
Pages: 336–351
DOI: 10.1520/STP36344S
ISBN-EB: 978-0-8031-4947-2
ISBN-13: 978-0-8031-0431-0