STABILITY OF PILE ANCHORS IN THE OFFSHORE ENVIRONMENT

For large floating or guyed compliant structures, the operational reliability of the mooring system, ie the seabed anchorage, is a vital component and hence a very important design consideration. One of the most widely used types of anchor for large offshore structures is the pile anchor. Pile anchors are essentially similar to conventional piles in their physical characteristics, the fundamental difference being in the way they carry the load. Whereas conventional piles transfer compressive loads from the supported structure to the foundation, pile anchors transfer tensile forces from the floating objects to the seabed. This paper reports on an experimental and theoretical study of the response of single pile anchors vertically installed in saturated cohesionless soil and subjected to either monotonic or cyclic loading applied at different angles of inclination. The experiments were conducted in a cylindrical steel tank of 2.4m diameter and 1.3m depth containing approximately a 10t mass of saturated uniform medium sand. The tank was welded onto a steel vibratory table in order to achieve different densities of sand by fluidising, and by vibratory compaction. A servo-controlled hydraulic actuator was used to apply a variety of monotonic and cyclic loadings to the pile anchors. The soil bed and model pile anchor were extensively instrumented and dynamically monitored during the tests.

  • Supplemental Notes:
    • Inst Marine Engineers Trans, v 107 pt 2, 1995, p 119 [16 p, 12 ref, 16 fig]
  • Authors:
    • Jamnejad, G E
    • Hesar, M A
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717523
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM