The ongoing and increasing demand for offshore piles has motivated the development of more reliable design methods and led to the recent development of ‘unified’ cone penetration test design methods to predict the axial capacity of driven piles installed in sand deposits and in clay deposits. However, many sites encountered in practice contain both sand and clay layers as well as silt layers and it is therefore important to assess the reliability of these new methods at such sites. This paper presents this assessment using a newly compiled database of pile load tests in interlayered deposits. It is shown that satisfactory predictions of capacities are attained using the sand and clay formulations of the ‘unified’ method with a correction applied to the sand method to enable prediction of shaft friction in silt deposits.

中文翻译：

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打入桩统一CPT法在层状矿床中的应用

对海上桩的持续和不断增长的需求推动了更可靠的设计方法的发展，并导致最近开发了“统一的”锥形穿透测试设计方法来预测安装在沙子沉积物和粘土沉积物中的打入桩的轴向能力。然而，在实践中遇到的许多场地都包含沙子和粘土层以及淤泥层，因此评估这些新方法在这些场地的可靠性非常重要。本文使用新编译的层间沉积物桩荷载测试数据库介绍了这一评估。结果表明，使用“统一”方法的沙子和粘土公式可以获得令人满意的容量预测，并对沙子方法进行校正，以预测淤泥沉积物中的轴摩擦。