本文首先通过在偏光显微镜下对湿陷前后的黄土薄片进行孔隙分布统计求出其湿陷空间,接着研究了黄土颗粒间的结构和连结特征,查明了遇水强度降低的连结,最后通过对外部因素——一定外荷和一定含水量——与内部条件的共同作用的研究,提出了黄土的湿陷机理。 In this paper, firstly, the space of disintegration of loess slices before and after collapsing was calculated under polarizing microscope to find the collapsing space, and then the structure and connection features between loess particles were studied, and the connection of reduced water intensity was found. Finally, External factors - a certain load and a certain amount of water content - with the internal conditions of the joint research, proposed loess collapsibility mechanism.