不同含水量亚黏土的崩解特性实验研究

Experimental study of the disintegration characteristics of loam with different moisture content

为了分析土的初始含水量与其崩解性的相关关系,选取了一种高孔隙率、粉黏粒含量较高,且不具有湿陷性的轻质亚黏土作为研究对象。对7组不同含水量的土样品进行崩解试验,发现随着初始含水量的增大,其崩解时间越长,初始含水量接近于风干含水量的土样品能够完全崩解,当初始含水量为天然含水量时,土样品崩解的过程是由"内"到"外",由整体崩解为大块,然后再崩解为更小的块状;当初始含水量为风干含水量时,土样品崩解过程是由"外"到"内"以鳞片状一层一层地崩解;随着土样初始含水量的增大其崩解速率逐渐变小,初始含水量接近风干含水量时,土样在完全崩解的过程中,其崩解敏感性较强;初始含水量接近天然含水量的情况下,在不完全崩解的过程中,其崩解敏感性较弱。

Soil disintegration has a close relationship with the initial water content. A kind of light loam with high porosity and high clay content and without collapsibility as the research object was selected in order to analyze the correlation between the initial soil water content and the disintegration. The disintegration test of samples of 7 groups with different moisture content was conducted. It is found that the time of complete disintegration increases with the increasing initial moisture content,and the soil sample,in which the initial water content is close to air drying moisture content,can be completely disintegrated,and disintegration time is much less than that of the soil samples,in which the initial moisture content is close to the natural moisture content. When the initial water content is equal to the natural water content,the process of the disintegration of soil samples is from the ＂inside＂to＂outside＂,the soil samples disintegrate to chunks,and then break up into smaller clumps. When the initial water content is equal to the air drying moisture content,soil samples disintegrate from ＂outside＂to ＂inside＂with scaly layers and layers. The rate of disintegration becomes smaller with the increasing soil initial water content. Under the condition of the initial water content approach equal to the air drying moisture content,the sensitivity of disintegration is stronger in the process of complete disintegration. Under the condition of the initial moisture content equal to the natural moisture content,soil samples do not completely disintegrate,and the sensitivity of disintegration is weak in the process.