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红色黏土结合水膜的厚度对其塑性、吸附性、渗透性、膨胀性和导电性等物理性质及强度、变形等力学性质起着控制性的作用。为了分析和计算离子土壤固化剂(ISS)处理红色黏土前后其结合水膜厚度的变化,进行了阿太堡试验、Zeta电位试验、电导率试验和比表面积试验。根据扁平状黏土颗粒结合水膜形成模型,推导了结合水膜厚度计算公式。根据液限含水率、比表面积和结合水密度,计算了ISS加固前后结合水膜厚度的变化。得出ISS加固红色黏土,能够降低其塑性指数,减小Zeta电位和电导率,从而使结合水膜厚度减薄,但不会改变黏土颗粒的双电层结构,不能完全去除红色黏土中的结合水。试验与理论计算结果表明,用塑性指数的降低来表征ISS减小红色黏土结合水膜是可行的、有效的。
The thickness of the red clay-bound water film plays a controlling role on the physical properties such as plasticity, adsorption, permeability, expansibility and conductivity, and mechanical properties such as strength and deformation. In order to analyze and calculate the change of the water film thickness before and after treatment of red clay with ionic soil curing agent (ISS), the experiments of Atalborg, Zeta potential, conductivity and specific surface area were carried out. According to the formation model of flat clay particles combined with water film, the formula of water film thickness is deduced. Based on the liquid-limited moisture content, specific surface area and combined water density, the changes of the combined water film thickness before and after ISS reinforcement were calculated. The ISS reinforced red clay can reduce its plasticity index, reduce the Zeta potential and conductivity, so that the thickness of the combined water film is thinned, but does not change the electric double layer structure of the clay particles and can not completely remove the bonding in the red clay water. Experimental and theoretical calculations show that it is feasible and effective to characterize the ISS to reduce the red clay bound water film by the decrease of plasticity index.