黄土微结构区域变化规律及与湿陷性相关性研究

Study on the relativities between Area Variation Regulation and the humid & sank characters of the Loessial Micro-configuration

黄土中的微结构是影响黄土湿陷的重要因素。本文运用扫描电子显微镜对黄土微结构进行观察并对统计数据进行了分析,结果表明黄土微结构在区域上存在一定的变化规律。即,由西北的粒状、支架接触式结构,逐渐过渡到东南的凝块、镶嵌胶结式结构。通过对黄土矿物颗粒接触关系和孔隙与湿陷性的关系的分析,并根据非饱和土粒间吸力理论分析,认为支架结构孔隙为黄土湿陷变形提供了空间条件,而黄土微结构吸力空间分布的不均匀性是引起黄土湿陷的根本原因。

The loessial micro--configuration is the main factor to influence it humid and sank. The article observes the configuration by electronic microscope and analyzes the statistic data. In conclusion, it is indicated that the configuration exists a certain variation regulation in areas. On the other words, the configuration gradually transfers to southeast clot and inlaid cementation one from northwest granule and bracket contact one. It analyzes the relation that the loessial mineral granules contact and the relation between those granules void and humid and sank character and also analyzes the affinity theory among non--saturation granules, it shows that the void for bracket one provides a room condition for loessial humid and sank distortion and the uneven suction character in space of the loessial micro--configuration is the essential reason to arouse the problem.