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通过对山西潞城黄土的微观结构分析研究,得出黄土的微观结构由两部分组成:松散结构和密实结构.松散结构的骨架主要由粉粒构成,粘粒和其它细小颗粒赋着于大颗粒表面,起着胶结作用,结构内部和结构之间存在着较大的孔隙.大孔隙的存在是产生湿陷的必要条件.“,”The microstructure of a collapsible loess was found to be dominated by the activity of worms to a depth of 26 m.The material was divided into dense and loose areas. The loose areas contained silt-clay aggregates with large voids between them.The presence of large voids permitted collapse to occur. No significant cementation has been found so far, although some of the non-collapsible material contained red-materials.It is suggested that the parent material differs progressively up the profile.