大贯入力海床式静力触探的硬土层物理力学指标对比

Comparative analysis of physical and mechanical properties for hard soil based on large penetration force seabed CPTU test

针对海上勘察硬土层静力触探数据难以获取的工程现状,基于国内首次大规模应用的大贯入力海床式孔压静力触探仪,采用国内外静力触探解译公式,对比分析三亚近海地区硬土层静力触探试验成果与室内土工试验、标准贯入试验的物理力学指标。分析表明:海床式静力触探试验解译得到的砂土内摩擦角、黏性土不排水抗剪强度等指标略大于室内试验与标准贯入试验,对硬土地区大贯入力孔压静力触探的分析研究,为类似工程提供了宝贵的经验与参考。

In view of the current engineering situation in which the CPTU data of hard soil are difficult to acquired in offshore investigation area,based on the first large-scale application of large penetration force CPTU equipment,comparative analysis is conducted with popular CPTU interpretation correlations for the physical and mechanical properties of Sanya offshore hard soil among seabed CPTU results,lab test result and SPT results.Comparative analysis shows that the internal friction angle of sand and the undrained shear strength of clay from CPTU test are slightly higher than that from lab soil test and SPT.The study on the hard soil with large penetration force CPTU provides useful experience and reference for the similar engineering.