文献类型： 会议论文

第一作者： J.S. Templeton III

作者： J.S. Templeton III ¹ ;

作者机构： 1.SAGE USA Inc.

会议名称： Offshore Technology Conference 2006:New Depths. New Horizons vol.3

主办单位：

页码： 1937-1951

摘要： This paper presents findings of a study of the foundation performance of jackup foundation spud cans in clay. The study was performed for the International Association of Drilling Contractors (IADC). The study findings resulted in significant proposed changes to improve current recommended practice for the site assessment of jackup performance under storm loading. The work reported here is particularly applicable to sites (such as in the Gulf of Mexico) at which jack-up spud cans have deep penetrations in soft clay. The objective of the study was to produce clay-specific alternatives to the present Bulletin 5-5 recommendations for spud can fixity assessment, Results presented here indicate that fixity assessments can be sufficiently improved to resolve much of the presently existing disparity between favorable field experience and less favorable Bulletin 5-5 fixity recommendations. Specific changes to SNAME Bulletin 5-5 have been recommended based on the results produced by the work reported in this paper. These recommended changes lie in 5 areas: Rotational Stiffness (via Modulus of Rigidity), Moment Capacity, Yield Interaction, Stiffness Reduction, and Hysteretic Damping. The methods for establishing spud can fixity currently recommended practice (SNAME Bulletin 5-5) can result in unfavorably and unrealistically low fixity estimates. The effect can be costly excess conservatism. Adoption of the changes based on the work described in this paper could result in site assessments which while remaining demonstrably conservative would be substantially more realistic than current practice, particularly in the case of deep penetrations in normally consolidated clay.

分类号： P75