| 摘 要： | In this paper, firstly, the amount of collapsible space is statistically determined from the pore-size distributions of loess slices before and after collapse by using a polarizing microscope. Then, the characteristics of the structure and the copulation of loess grains are studied, and the copulations which decrease in strength upon contact with water are discovered. Lastly, by studying the joint action of external causes——a certain load and a certain moisture content——and internal conditions, the mechanism of loess collapse is advanced.
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