In geological surveys of coastal regions, data interpretation and site identification are usually affected by underground water (including salinity). This study aimed to investigate the effect of pore-water salinity on soil identification via in situ CPTs. Combinations of triaxial shearing, cone penetration, and vane shear tests were also performed at a laboratory scale on Lianyungang marine clay with different pore-water salinities. The results suggested that the effective friction angles and shear strength increased with the pore-water salinity. The in situ CPTs showed that the normalized tip resistances increased with an increase in pore-water salinity, whereas no significant correlation between the normalized sleeve fraction and salinities was found. The use of the conventional soil identification method (soil-behavior-type chart, i.e., SBT chart) may be effective in very low-salinity conditions despite that it does not take into account the pore-water salinity effect. The salinity investigation of Lianyungang marine clay suggests that an inhomogeneous salinity distribution significantly influences soil identification when with rich clay mineral of montmorillonite and high pore-water salinity. From the theoretical and practical analyses, an improved soil identification method considering pore-water salinity modification was proposed to avoid the misclassification of in situ soil.

在沿海地区地质调查中，数据解释和场地识别通常受到地下水（包括盐度）的影响。本研究旨在通过原位 CPT 研究孔隙水盐度对土壤识别的影响。还在实验室规模上对具有不同孔隙水盐度的连云港海相粘土进行了三轴剪切、锥入度和叶片剪切试验的组合。结果表明，有效摩擦角和剪切强度随着孔隙水盐度的增加而增加。原位 CPT 显示归一化的尖端阻力随着孔隙水盐度的增加而增加，而归一化的套管分数和盐度之间没有显着相关性。使用传统的土壤识别方法（土壤行为类型图，即 SBT 图）在盐度非常低的条件下可能是有效的，尽管它没有考虑孔隙水盐度的影响。连云港海相粘土盐度调查表明，当蒙脱石粘土矿物含量丰富、孔隙水盐度高时，不均匀的盐度分布显着影响土壤识别。从理论和实践分析出发，提出了一种考虑孔隙水盐度修正的改进土壤识别方法，以避免原位土壤的错误分类。连云港海相黏土盐度调查表明，当蒙脱石黏土矿物含量丰富、孔隙水盐度高时，不均匀的盐度分布对土壤识别有显着影响。从理论和实践分析出发，提出了一种考虑孔隙水盐度修正的改进土壤识别方法，以避免原位土壤的错误分类。连云港海相黏土盐度调查表明，当蒙脱石黏土矿物含量丰富、孔隙水盐度高时，不均匀的盐度分布对土壤识别有显着影响。从理论和实践分析出发，提出了一种考虑孔隙水盐度修正的改进土壤识别方法，以避免原位土壤的错误分类。