中文摘要：

在分析桩靴式钻井平台插桩过程中地基土的破坏形式的基础上,将桩靴下土体破坏面假定为锥形面,根据极限平衡理论,推导出了均匀、双层地基土中基于被动土压力的插桩阻力计算公式。通过插桩实例对所推导的公式进行了验证,分析比较了极限承载力与插桩阻力的异同,讨论了插桩阻力计算公式推导过程中土体假设为锥形破坏面的合理性,认为本文推导的插桩阻力计算公式作为桩靴式钻井平台插桩深度预测方法更接近实际插桩结果。

英文摘要：

Theauchors analyzed the foundation soil failure mode during pitching pile of footing jackup drilling platform.The soil failure plane under pile shoe is assumed cone failure plane and the penetration resistance computational formula in uniform and two-layer foundation soil on passive earth pressure is derivated in accordance with limit equilibrium theory.Based on the analysis and comparison with penetration resistance and ultimate bearing capacity,rationality of assumed soil fracture is demonstrated in the derivation process of the penetration resistance computational formulas.Formula of penetration resistance deducted in this essay as the prediction methods of insertion depth of footing jackup drilling platform is proved to be much closer to the actual value compared with the ultimate bearing capacity and has a strong practical value.