A Novel Mixed-in-Place Pile System for Offshore Platforms

A novel mixed-in-place pile (MIDOS) has been developed by BAUER for supporting piled offshore platforms. The mechanical technology and in situ pile performance were successfully demonstrated during an in situ test in silica sand, where the tension capacity reached 9MN. This paper investigates the axial bearing capacity on one MIDOS test pile in a silica deposit where a dynamic test has been conducted using the “high-strain” testing method. The interpretation of the results was performed by means of the Control and Provisioning of Wireless Access Points (CAPWAP) signal matching method. The static bearing capacity mobilized by the dynamic pressure of the load test reached 15.4MN (12.7MN skin friction and 2.7MN end bearing capacity). Analysis of the loads achieved in the dynamic test suggests that the MIDOS pile performs similarly to conventional bored piles in silica deposits with a Dr of about 80%. The research scope was subsequently extended to include laboratory studies in calcareous deposits. These investigations have shown that the MIDOS pile is a feasible foundation alternative for carbonate sand deposits where extreme compression at high confining stresses results in very low values of skin friction for driven piles. Laboratory tests on the steel-carbonate grout interface show a characteristic slip-stick response, which is thought to be related to the potential energy required to overcome interface locking followed by a relative short movement along a low resistance plane before reaching a similar interlocking resistance.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 382-392
  • Monograph Title: Geo-Chicago 2016: Geotechnics for Sustainable Energy

Subject/Index Terms

Filing Info

  • Accession Number: 01612415
  • Record Type: Publication
  • ISBN: 9780784480137
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:06PM