孔压静力触探数据与黏性土不排水抗剪强度的相关性分析  

Analysis of correlation between CPTU data and undrained shear strength of cohesive soil

作　　者：杜宇[1] 郭晓勇[1] DU Yu;GUO Xiao-yong(CCCC-FHDI Engineering Co.,Ltd.,Guangzhou 510230,China)

机构地区：[1]中交第四航务工程勘察设计院有限公司

出　　处：《水运工程》2019年第9期289-293,共5页Port & Waterway Engineering

摘　　要：利用孔压静力触探(CPTU)数据可解译黏性土的不排水抗剪强度,而采用不同试验方法测定的黏性土不排水抗剪强度并非固定值。通过对比分析,得出CPTU数据与不同试验方法(包括直剪试验、固快试验、不固结不排水三轴压缩试验等方法)得出的细粒土不排水抗剪强度的相关关系。结果表明,不同试验得出的黏性土不排水抗剪强度与CPTU数据具有非常好的相关性;对于不同试验得出来的抗剪强度需要采用不同的系数Nkt进行换算。The cone penetration test with pore pressure measurement(CPTU)data can be used to interpret the undrained shear strength of cohesive soil,but the undrained shear strength of cohesive soil is not a fixed value by the different test methods.Through comparative analysis,we obtain the correlations of CPTU data with fine-grained soil’s undrained shear strength derived from different testing methods(including direct shear test,consolidated direct shear test,unconsolidated undrained triaxial compression test,etc).The results show that the undrained shear strengths of cohesive soil by different tests have good correlation with CPTU data.The undrained shear strengths of cohesive soil by different tests should be converted by the coefficient N kt.

关 键 词：孔压静力触探 不排水抗剪强度 直剪试验 固快试验 三轴试验 

分 类 号：TU41[建筑科学—岩土工程] U652.2[建筑科学—土工工程]