Abstract Bearing capacity of offshore pipe pile is difficult to predict due to the soil variability and uncertainly associated with the field investigation and soil-pile interactions. This paper examines factors affected prediction errors of bearing capacity based on the in-situ cone penetration test (CPT) results for pipe piles. The uncertainly of transformation, geomaterials and field experiments were characterized with 33 experimental bearing capacity test results. A modified CPT based bearing capacity calculation approach was proposed by a probability evaluation method. A field full-scale bearing capacity test for offshore pipe piles was carried out. The test results were presented and discussed. Then, the American Petroleum Institute (API) and Det Norske Veritas (DNV) and the proposed modified approach were used to verify with the measurement results. Through the comparative analysis, it shown that the API approach has better performance than the DNV method for this field project case. However, both the API and DNV approaches have prediction errors greater than 5.3% which is higher than that from the modified approach. Apart from that, the modified approach could indicate results with various confidence intervals, which would helpful for the design of pipe piles.

中文翻译：

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考虑不确定性的CPT海上管桩承载力分析

摘要 近海管桩承载力由于土壤变异性和现场调查和土桩相互作用的不确定性而难以预测。本文根据管桩的原位锥入度试验（CPT）结果，研究了影响承载力预测误差的因素。用33个试验承载力测试结果表征了转变、地质材料和现场试验的不确定性。提出了一种基于概率评估方法的改进的基于CPT的承载力计算方法。开展了海上管桩现场全尺寸承载力试验。测试结果进行了介绍和讨论。然后，美国石油协会 (API) 和挪威船级社 (DNV) 和提议的修改方法用于验证测量结果。通过对比分析，表明API方法在该现场项目案例中比DNV方法具有更好的性能。然而，API 和 DNV 方法的预测误差均大于 5.3%，高于修改后的方法。除此之外，修改后的方法可以指示具有不同置信区间的结果，这将有助于管桩的设计。