Effect of spudcan geometry on penetration and extraction resistance in clay
Effect of spudcan geometry on penetration and extraction resistance in clay
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DOI：
10.1680/geot.14.t.021
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发表时间：
2015-09
期刊：
影响因子：
5.8
通讯作者：
M. Hossain;Jingbin Zheng;A. Huston
中科院分区：
文献类型：
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作者：
M. Hossain;Jingbin Zheng;A. Huston
各种几何形状的桩靴基础通常用于支撑海上石油和天然气钻井（自升式）钻机的领域。本文研究了在正常固结和轻度超固结的软粘土中，泥罐及其底部几何形状对贯入阻力和拔出阻力的影响。一系列的离心试验进行了三个不同的几何形状的模型drepdcans通常在现场使用。从直径为2·64 × 103（面积当量）的穿刺中提取了骨水泥罐，手术时间为19个月。额外的大变形有限元分析允许探索一系列的crackdcan基地的几何形状。积累了相应的现场数据。本研究的结果证实了圆形圆锥形基础假设的准确性，并使用面积等效直径评估了ISO指南19905-1所建议的抗沉贯性。基于平面的圆板的模拟导致了19%的高电阻率。
Spudcan foundations of various geometries are commonly used in the field for supporting offshore oil and gas drilling (jack-up) rigs. This paper investigates the effect of the spudcan and its base geometry on the penetration and extraction resistance in soft normally and lightly overconsolidated clay. A series of centrifuge tests was undertaken on model spudcans of three different geometries typically used in the field. The spudcans were extracted from penetrations of 2·64∼3 (area equivalent) diameters and after an operation period of ∼19 months. Additional large-deformation finite-element analyses allowed for exploring a range of spudcan base geometries. Corresponding field data were accumulated. The results from this study have confirmed the accuracy of the assumption of a circular conical-based footing and the use of area equivalent diameter for assessing spudcan penetration resistance, as suggested by ISO guidelines 19905-1. Simulation of a flat-based circular plate resulted in 19% higher resistance c...