低液限粉土微观结构试验研究

Microstructure of low liquid limit silt

土的工程性质从本质上来说是取决于其微观结构,是土体结构单元体性质的综合体现。利用扫描电子显微镜、矿物X衍射等设备对低液限粉土的微观结构进行了研究。通过微观结构分析从矿物成分和结构两方面来评价低液限粉土的工程特性。从而得到低液限粉土在不同的压实度状态下呈现不同的结构形式与联结形式,以及不同的排列状态需要依靠孔隙比由里到外展现出来。这样就可以借助于提高压实度来改变粉土的联结形式和改变粉土颗粒的排列顺序,进而提高低液限粉土的工程特性。

The engineering property of soils is in substance determined by their microstructure with embodies unit property of soils. Scanning electron microscope equipment and mineral X-ray diffraction equipment are used to study the microstructure of low liquid limit silt. The engineering property of the low liquid limit silt is evaluated from the mineral ingredient and the structure by virtue of microstructure. The low liquid limit silt presents different structural and coupling modes under different compaction degrees. Different arrangements of particles from inside to outside are characterized by the void ratio. So enhancing the compaction degree alters the coupling modes of silt and the arrangement sequence of silt particles so as to increase the engineering property of the low liquid limit silt.