FIELD MODEL TESTS AND ANALYSES OF SUCTION INSTALLED LONG-SKIRTED FOUNDATIONS

A series of five model tests with seven-cell model foundation were carried out on a soft clay site in the vicinity of Gothenburg. The individual cell diameter was 0.6m and the skirt penetration depths were in the range of 0.3-0.5m. The foundations were installed by means of suction and subjected to a combination of static and cyclic loads simulating the loading conditions of a deep-water concrete platform. Deformation measurements of the foundation and the surrounding soil, pore pressure and pressure development inside the foundation cells were recorded and analysed together with load data. In this way information was collected regarding; i) penetration resistance during installation; ii) foundation stiffness and stiffness degradation; iii) static and cyclic foundation capacity; iv) settlement and shake down under cyclic loading; and v) load distribution between skirts and base. A series of FE analyses as well as stability analyses were carried out prior to and in parallel with the model test programme. Comparisons between calculated and measured behaviour have been performed with special emphasis on foundation stiffness and capacity. The test results show that considerable reductions in rocking spring stiffness can develop even at low to intermediate load levels with correspondingly high hysteresis damping. Foundation capacities correspond reasonably well with predictions and shake down settlements were small.

• Supplemental Notes:
  • Procs. of Intl. Conference on Behaviour of Offshore Structures (BOSS '88), held Trondheim, Norway, June 1988, Vol. 1: Geotechnics, p. 243 [13 pp., 6 ref., 2 tab., 12 fig.]
• Authors:
  • Andreasson, B
  • Christophersen, H P
  • Kvalstad, T J
• Publication Date: 1988

Language

• English

Subject/Index Terms

• TRT Terms: Finite element method; Soil mechanics; Soil structure interaction
• Uncontrolled Terms: Model tests
• Old TRIS Terms: Element method offshore structures
• Subject Areas: Marine Transportation;

Filing Info

• Accession Number: 00695127
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM