不同黏粒含量红黏土失水与开裂关联性分析

Correlation Analysis between Water Loss and Cracking of Red Clay with Different Clay Content

为了研究不同黏粒含量对红黏土裂隙性的影响,制备4种含水率的试样,分别观察试样在20℃和60℃2种温度条件下裂隙的发展规律,并使用Image J图像处理软件对裂隙面积、裂隙率、裂隙长度进行测量和计算,对失水过程与开裂过程进行关联性分析。结果表明:当含水率相同时,相同黏粒含量红黏土的裂隙面积和裂隙长度发育的起止失水率随温度的升高而增大;当失水温度相同时,相同黏粒含量红黏土裂隙面积和裂隙长度发育的起止失水率随初始含水率的增大先下降后上升;当温度和含水率相同时,红黏土的表面收缩率随黏粒含量的增加逐渐减小;黏粒含量的变化与试样裂隙面积、裂隙长度发育的起止失水率之间未呈现出明显关联。

In order to study the influence of different clay content on the fissure property of red clay,four kinds of samples with water content were prepared,and the fissure development laws of the samples were observed at 20℃and 60℃respectively.The fissure area,fissure rate and fissure length were measured and calculated by Image J image processing software,and the correlation analysis between the water loss process and the fissure process was carried out.The results show that when the water content is the same,the water loss rate from start to stop of development of fissure area and fissure length of red clay with the same clay content increases with the increase of temperature.When the water loss temperature is the same,the start-stop water loss rate of the development of fissure area and fissure length of red clay with the same clay content first decreases and then increases with the increase of initial water content.When the temperature and water content is same,the surface shrinkage of red clay gradually decreases with the increase of clay content.There was no obvious correlation between the change of clay content and the water loss rate from the beginning to the end of the development of crack area and length.