改性黄土内摩擦角变化研究

通过改性黄土抗剪强度试验，研究出黄土在添加膨润土、石灰、水泥和水泥一粉煤灰混合材料后内摩擦角的变化趋势。黄土在添加膨润土过程中，随着膨润土的添量增大到一定程度时，土体的内摩擦角是减小的。这主要是因为黏粒舍量的增加，土体在抵抗剪切变形过程中，土体颗粒克服爬坡和咬合阻力所做的功减小，此时剪应力大部由黏聚力承担。石灰、水泥和水泥-粉煤灰混合材料加入土体中后，形成大的团聚体结构，加强了土体颗粒之间互相嵌合度和摩擦面积，土体的内摩擦角得到不同程度的增大。因此，根据工程需要，向黄土中添加不同的改性材料，使土体的性质满足工程需要是完全可行的。

Study of Change of Modified Loess f Internal Friction Angle

By adopting shear strength test, changing trend of modified loess internal friction angle is obtained when added with bentornite, lime, cement and cement-fly ash mixture. When bentornite added into loess, internal friction angle of modified loess is reduced with the proportion of bentornite increased. Due to the content of clay increased, the work that particle applies for overcoming climbing-slope and occlude decreases, and now greater part of shearing stress is borne by cohesion. After lime, cement and ce...