含水率对湖相淤泥次生粉质黏土力学特性影响

Effect of Water Content for Mechanical Properties of Lacustrine Facies of Secondary Silty Clay

以某铜矿湖相淤泥区域露天开采为工程背景,通过对7种不同含水率湖相次生粉质黏土试样,开展室内直剪和固结试验研究。研究结果表明:湖相次生粉质黏土的含水率与凝聚力、内摩擦角、孔隙比、压缩系数和压缩模量均呈现指数型的关系,且该湖相次生粉质黏土的最优含水率为16.6%左右,其数值略小于塑限指标,凝聚力、内摩擦角和孔隙比随着含水率的增大而减小,研究结果可为后期工程选择合理的堆载厚度与露采边坡角取值提供参考依据。

Considering the special engineering background adopt open pit under lacustrine silty clay area of a copper mine,the direct shear test and consolidation test was carried out on seven kinds of secondary silty clay samples with different water content.the results show that the water content of the lacustrine secondary silty clay has an exponential relationship with cohesion,internal friction angle,void ratio,compression coefficient and compressive modulus,and the optimal water content is about 16.6%,and its value is slightly smaller than the plastic limit index.the cohesive force,internal friction angle and void ratio decrease with the increase of water content.the research results can select reasonable stacking thickness and exposed slope for open-pit mining engineering.