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本文对比较特殊的湛江沿海地区的土样进行了研究,从物理性指标的数值上看,该土的工程性质似较差,其天然含水量为40～45％,孔隙比为1.17～1.28,液限为66％左右等。但从力学性指标来看,其工程性质似较好,其无侧限抗压强度达5～6kg/cm~2,表观先期团结压力达9kg/cm~2。另外,该土风干前后的性质变化明显,液限差14～18％,摩擦角Ф差3～6°。本文中应用了偏光显微镜、扫描电子显微镜和X射线衍射仪分别对试样的组构特征及扁平颗粒的定向排列特征作了观察和测定。并研究了联结组构单元和颗粒单元之间的胶结物质的作用,提出一种结构模式,用以阐述湛江土的某些特殊性质的形成原因。
In this paper, the soil samples of the special Zhanjiang coastal area were studied. From the numerical point of view of the physical indicators, the engineering properties of the soil appear to be poor, with a natural moisture content of 40 to 45% and a void ratio of 1.17 to 1.28. The liquid limit is about 66%. However, from the perspective of mechanical properties, its engineering properties are likely to be better, its unconfined compressive strength of 5 ~ 6kg/cm ~ 2, the apparent early solidarity pressure of 9kg/cm ~ 2. In addition, the nature of the soil before and after air drying changes significantly, the liquid limit difference is 14% to 18%, and the friction angle enthalpy difference is 3 to 6°. In this paper, the microstructure and orientation of the flat particles were observed and measured using polarized light microscope, scanning electron microscope and X-ray diffractometer. The effect of the cemented material between the bonded structural unit and the granular unit was studied, and a structural model was proposed to explain the formation reasons of some special properties of Zhanjiang soil.