混合破坏模式在自升式钻井平台插桩中的应用

Application of the mixed failure model in footing penetration analysis of jack⁃up rig

自升式钻井平台插桩深度分析要求高,难度大,可检验性非常强。常规计算模式主要为“穿刺破坏模式”和“排挤破坏模式”。对于某些地质条件复杂的井场,按这两种模式分析计算的结果仍存在个别预测不准的情况。因此,如何提高钻井平台插桩分析的准确性,是目前需要攻克的一个技术难点。在总结工程插桩实践经验的基础上,提出了一种新的分析模式,即“混合破坏模式”。以南海一个工程实例进行具体分析,该井场应用“混合破坏模式”分析的插桩结果与实际结果较为吻合。并对数个复杂井场的实际插桩结果进行了统计分析,总结了桩端土体破坏模式的影响因素及“混合破坏模式”的特点,为在复杂地层中进行插桩分析提供了参考。

The footing penetration analysis of jack⁃up rig is very demanding,difficult and testable.The conventional calculation methods of soil failure model are mainly"punch through model"and"squeezing model".For some well sites with complicated geotechnical conditions,the results of footing penetration analysis with these two models are still inaccurate.Therefore,how to improve the accuracy for footing penetration analysis of jack⁃up rig is a technical difficulty needed to be overcome.On the basis of summing up the practical experience of footing penetration,a new analysis model is put forward,namely"mixed failure model".Based on an engineering example in South China Sea,the footing penetration results obtained by using"mixed failure model"are in good agreement with the actual results.The statistical analysis of the actual footing penetration results of several complex well sites is carried out,and the influencing factors of the soil failure model and the characteristics of"mixed failure model"are summarized,which provides a reference to carry out the analysis of footing penetration in complex strata.