膨胀土成分和微结构试验研究

Experimental Study on Material Composition and Microstructure of Expansive Soil

文中以蒙自市城区西北部的雨过铺镇工程案例为例,通过对所取的三种不同位置的原状土样进行XRD试验,结果表明,三种土样成分基本上均由云母、石英、高岭石、蒙脱石等矿物组成,1^(#)土样和2^(#)土样粘土矿物含量较3^(#)高,1^(#)土样和2^(#)土样的膨胀性也较3^(#)强。通过对所取的三种不同位置的原状土样进行电镜试验,试验结果表明,1^(#)和2^(#)土样粘土矿物的水平定向度更为显著,而且粘土矿物排列更加紧密。

This paper takes Yuguopu Town project in the northwest of Mengzi City as an example,XRD tests were conducted on three undisturbed soil samples taken at different locations.The test results showed that the composition of the three soil samples was basically composed of mica,quartz,kaolinite,montmorillonite and other minerals,and the clay mineral content of the 1^(#)and 2^(#)soil samples was higher than that of the 3^(#)soil samples.The swelling of soil samples 1^(#)and 2^(#)is also stronger than that of 3^(#).Electron microscope tests were carried out on undisturbed soil samples taken from three different locations,and the test results showed that the horizontal orientation of clay minerals in soil samples 1^(#)and 2^(#)was more significant,and the clay minerals were more closely arranged.