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随着海洋工程的发展,自升式钻井平台被应用于水深更大,环境条件更加恶劣的海域。在这种情况下,自升式钻井平台桩靴的插深预测就成为钻井平台设计计算的重点和难点。原有的计算方法已经不能满足实际工程的需要。为了提高预测精度,根据桩靴贯入砂土的特点,采用球孔扩张理论模拟了桩靴贯入过程中的应力场变化,推导出了该条件下球孔扩张的极限扩孔压力的理论解。在此基础上对钻井船桩靴与静力触探探头受力进行了对比,推导了利用孔压静力触探试验数据计算桩靴承载力的理论表达式。为了验证公式的可靠性,选取中国南海6个实际工程,分别利用传统方法以及本文公式对插桩深度进行了预测,并将预测结果与实测结果进行对比,结果显示方法和实测结果吻合较好。
With the development of offshore engineering, self-elevating drilling platforms are used in areas with greater water depth and harsh environmental conditions. Under such circumstances, the prediction of insertion depth of pile jacks of jack-up drilling platform becomes the key and difficult point in the design and calculation of drilling platform. The original calculation method can no longer meet the needs of the actual project. In order to improve the accuracy of prediction, according to the characteristics of the pile shoe penetrating into the sand, the stress field of the pile shoe during penetration is simulated by the hole expansion theory. The theoretical solution of the limit expansion pressure of the ball hole expansion under this condition is deduced . On this basis, the comparison between the force of pile driver’s shoe and static probe was carried out, and the theoretical expression for calculating the bearing capacity of pile foot was deduced by using the test data of hole pressure static penetration. In order to verify the reliability of the formula, six practical projects in the South China Sea were selected. The depth of the instrumented pile was predicted by the traditional method and the formula in this paper. The predicted results were compared with the measured ones. The results show that the measured values agree well with the measured ones.