【摘要】 基于大量的土工试验,对长江下游苏通大桥工程区水下粉质黏土的工程特性进行研究,发现粉质黏土的不同指标的变异系数差别较大。土颗粒比重、天然密度、饱和度的变异系数较小,天然含水量、天然孔隙比、液限的变异系数一般,塑限、压缩模量、压缩系数、黏聚力、内摩擦角、标贯击数等的变异系数较大;液限与天然含水量不存在相关关系,塑限与天然含水量的相关性较好,而天然孔隙比与天然含水量、天然密度的相关性很好;压缩模量、压缩系数与天然孔隙比、天然含水量、天然密度的相关性较好,相关系数达0.87以上;压缩系数与液限不存在相关关系,但压缩系数与塑限存在相关关系,相关系数为0.611 09。结果表明,对大量试验数据的统计分析是研究土工程特性的重要方法。更多还原

【Abstract】 Based on large numbers of geotechnical testst,he engineering characteristics of silty clay under water in the foundation of Suzhou—Nantong large bridge in lower reach of Yangtze River,Jiangsu Province,China,was studied.It was found that the variation coefficients of silty clay parameters were different.The variation coefficients of specific gravity,natural density,saturation of soil grain were smaller,the variation coefficients of natural water content,natural void ratio,and liquid limit were moderate;and those of plastic limit,compressive module,compressive coefficient,coherent strength,inner friction angle,the blow counts of standard penetration test(SPT) were greater.For physical parameters,there didn′t exist correlativity between liquid limit and natural water content,the correlativity between plastic limit and natural water content was better;and the correlativity between natural void ratio and natural water content,natural density were very good.For deformation parameters,the correlativity between compressive module,compressive coefficient and natural void ratio,natural water content,natural density were better;and the correlativity coefficients were greater than 0.87.There didn′t exist correlativity between compressive coefficient and liquid limit,but there was correlativity between compressive coefficient and plastic limit;and the correlativity coefficient was 0.611 09.The results indicate that the statistical analysis of geotechnical test data is an important method for the study of soil engineering characteristics.更多还原