A large number of experiments about natural Q2 loess from Pucheng power plant in Shanxi Province were con-ducted on the relationship between the collapsibility of Q2 loess and the matter composition ,physical index and quantified parameter of soil microstructure .The results showed that the collapsibility of Q2 loess decreases with the increase of clay content ,pH value ,degree of saturation ,dry density ,distribution fractal dimension and orientation degree of particle , whereas increases with the increase of void ratio ,Euler value ,distribution fractal dimension and orientation degree of pore ,and is hardly affected by the soluble salt content .The collapsibility of Q2 loess is affected by various factors ,the internal cause mainly is the matter composition and special structural properties of Q2 loess ,and the main external cause is the pressure and water content .The collapsible deformation can be possibly caused by the destroying of the open work pore and the decreasing even disappearing of the inter-particle pore ,the latter one shouldn't be ignored .%通过单向压缩湿陷试验研究了陕西蒲城地区Q2黄土的湿陷性 ,并分析了其与物质组成、物性指标及微观结构定量参数之间的关系.结果表明 :Q2黄土湿陷性随黏粒含量、pH值、饱和度、干密度、颗粒分布分维和定向度的增加而降低 ;随孔隙比、欧拉数、孔隙分布分维和定向度增加而降低 ;易溶盐含量对Q2黄土湿陷性影响不大.Q2黄土的湿陷性受多方面因素制约和影响 ,内因主要是由于黄土本身的物质成分和特殊的结构特性 ,外因则是压力和水的作用 ;架空孔隙的失稳破坏和粒间孔隙的变小消失都可能引起湿陷变形 ,对于Q2黄土后者引起的湿陷变形不容忽视.
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