黏土含量对洞庭湖区吹填土抗剪强度的影响研究

Effect of Clay Content on Shear Strength of Dredger Fill in Dongting Lake

洞庭湖区公路路基主要由吹填土筑成。吹填土中的黏土含量对其强度性质有显著的影响,通过改变吹填土中的黏土含量,可提高土体强度。抗剪强度试验研究结果表明:随着黏土含量的增加,土样的内摩擦角降低,黏聚力增加,剪切强度呈先增加后降低再增加的趋势。将数据点进行曲线拟合之后,得到了剪切强度与剪切位移的变化关系,以及黏土含量与内摩擦角、黏聚力、剪切强度之间的关系表达式。

As we all know, the clay content in Donging Lake Area has obvious impact on the strength of dredger fill. By changing the content of clay in the dredger fill,soil strength can be improved. The results of shear strength test show that the internal friction angle of the soil sample decreases and cohesion increases with the increase of clay content. The shear strength is increased first followed by decreased and then increased. After the data points curve fitting, we can obtain the variation relationship between shear strength and shear displacement, and the equation between clay content and internal friction angle, cohesion and shear strength.