2008•Journal of Guilin University of TechnologyRequires access
Permeability Test of Ningming Expansive Soil
Heping Yang
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Abstract
Based on the known soil properties and the characteristics of soil structure,saturated permeability test,pressure plate test and shrinkage test are conducted on undisturbed and remolded samples of two types of expansive soil.By testing and indirect method,the permeability coefficient of the unsaturated expansive soil and its variation with moisture content are obtained.The study shows that minerals and soil structure influence the permeability of expansive soil.The more expansive clay mineral,the lower the permeability.Permeability greatly decreases after undisturbed soil is remolded and soil microstructure is broken.The permeability coefficient of the Ningming expansive soil sharply decreases with the decrease of moisture content(increase of matric suction).The relation between permeability coefficient and moisture can be fitted by exponential function.