掺粉煤灰压实黄土环剪试验研究

为了探究掺粉煤灰压实黄土残余强度特性,采用HJ-1型环剪仪对不同含水率和不同粉煤灰掺量条件下的黄土进行试验研究。结果表明:随着粉煤灰掺量的增大,土样最大干密度近似呈线性减小,而最优含水率近似呈线性增加;平衡含水率以下,残余强度与掺灰量呈负相关,平衡含水率以上,残余强度与掺灰量呈正相关。在工程应用中,可以考虑用适量粉煤灰处理较湿土,以达到降低土体自重,同时增强残余强度的目的。

Ring Shear Test of Compacted Loess Blended with Fly Ash

In order to explore the residual strength characteristics of compacted loess blended with fly ash, and provide reference for engineering practice, we carry out experimental research on loess by using HJ-1 ring shear apparatus in the presence of different moisture contents and blending ratios of fly ash. The results showed that 1) with the increase of blending ratio of fly ash, the maximum dry density linearly decreases, whereas the optimum moisture content linearly increases; 2) if moisture content is below equilibrium moisture content, the relation between residual strength and blending ratio of fly ash shows tendency of negative correlation, otherwise, the relation shows tendency of positive correlation. In actual projects, we can treat wet soil with suitable proportions of fly ash to reduce the self weight of soil and to improve residual strength.