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回顾了基于CPTU测试成果确定粘土固结屈服应力和超固结比的方法,表明土的固结屈服应力和超固结比与CPTU测试参数之间不存在惟一的相关关系,仅仅针对某一地区的相关关系才是有效的.根据苏北里下河地区泻湖相沉积土的CPTU测试资料,对3种经验方法进行了比较.评价了固结屈服应力与CPTU测试参数现有经验关系的有效性,并且确定出适宜于里下河地区泻湖相沉积土的预测方法.结果表明:基于净锥尖阻力的相关关系比其他经验方法具有较高的精度,可以有效地预测该地区泻湖相沉积土的固结屈服应力和超固结比.
The methods of determining the yield stress and excess consolidation ratio of clay based on the results of CPTU test are reviewed. It shows that there is no unique correlation between the consolidated yield stress and overconsolidation ratio of soil and the CPTU test parameters, and only for a certain area Is valid.According to the CPTU test data of lacustrine sediment in the Lixiahe area of northern Jiangsu, three empirical methods are compared and the validity of the existing empirical relationship between the consolidation yield stress and the CPTU test parameters is evaluated , And the prediction method suitable for lacustrine sediment in Lixiahe area is determined.The results show that the correlation based on the net cone tip resistance has higher accuracy than other empirical methods and can effectively predict the lacustrine sediment in the area Consolidation yield stress and overconsolidation ratio.