灾害性膨胀土的微结构特征及其工程性质

Nicrostructure Characteristics and Engineering Properties of Expansive Soil

文中研究了我国一些典型膨胀土的微观结构特征，将膨胀土中的微观结构单元归纳为三种类型，并将由结构单元组成的微结构特征分为六种。讨论了微结构特征与膨胀势的关系。研究了膨胀土中的光滑裂隙面的特征，如物质组成、微结构定向性等，并将定向特征与力学强度建立了关系。

Microstructure characteristics of representative expansive soils in China are studied.Micro-structure units in soils are summed up into three categories and microstructure characteristics,which consist of the structure units,are classified as six kinds.Relationship between microstructure characteristics and the expansive potential of the soils are discussed.The properties of smooth crack surface in the expansive soils,such as material component,microstructure orientation feature etc.are specially studied.Correlation between microstructure orientation degree and mechanical strength is obtained. Measurement results indicated that friction angle of the soils decreases with increases of orientation degree.