Microstructure and expansion properties of expansive soil in Longnan District

The microstructure and mineral composition of the expansive soil along Shiyan to Tianshui expressway in Longnan District were analyzed though scanning electron microscope (SEM) experiments and X-ray diffraction (XRD) experiments, and the expansion properties of expansive soil in this district were analyzed. According to the experiment results, the expansive soil particles basically presented as laminas with or without bending, which showed the properties of montmorillonite mineral particles or mixed-layer mineral particles of montmorillonite and illite; Lamelliform mineral particles were contacted surface to surface, and there were small gaps among the mineral particles; The mineral composition of this expansive soil was analyzed qualitatively and quantitatively, which showed small property of montmorillonite and large property of illite, kaolinite and quartz. Based on the experiment results above, the expansive soil along Shiyan to Tianshui expressway in Longnan legion of Gansu province was judged as weak expansive soil.

Project Supported:

Clc Number: