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黏性土结合水吸附动力学模型及机理研究(2013-2016)

作者: 来源: 日期:2017-4-27 11:32:04 人气:26 评论:0 标签:

 

项目来源:国家自然科学基金(面上项目)

 

项目简介:

    结合水的类型、形成过程对黏性土表现出来的物理-化学-力学性质具有强烈影响,同时还是引发黏性土一系列工程地质问题的重要因子。为了研究黏性土在水蒸气,在土-水界面、在不同电解质溶液中吸附结合水的流动、渗透、扩散的模型与机理,需要系统开展等温、等湿、变温变湿、变PH 值、变阳离子种类的吸附动力学实验,并对在特定环境下吸附结合水后的黏性土进行X 射线衍射、红外光谱、差示扫描量热、阳离子交换量、孔隙分布等实验,根据结合水吸附动力学曲线、热力学曲线和实验结果,揭示黏性土在水蒸气,在土-水界面、在不同电解质溶液中吸附结合水动力学机理,建立吸附结合水控制理论;利用Monte Carlo 方法等模拟黏性土吸附结合水的动力学效应,建立不同黏土矿物单片-表面电荷-吸附阳离子-结合水相互作用的理论。研究成果可为由结合水引起工程问题的预测与防治提供关键理论和技术支撑,促进土质学、土力学、工程地质学和土壤学基础理论发展。

The effects of the type and formation of adsorbed water on physical-chemical-mechanical properties of clay have been discussed. The adsorbed water is an important factor which lead to a series of engineering geological problems of cohesive soil. In order to study the mechanism and model of cohesive soil adsorbed water in water vapor, in soil-water interface and in different eletrolyte solution,the isothermal adsorption, isohume adsorption, different PH, different cation type adsorption kinetics experiments will be carried. The cohesive soil after adsorption water then will performe the X-ray diffraction, infrared spectroscopy, differential scanning calorimetry, cation exchange capacity and pore size distribution experiments. According to the adsorption curve of water adsorption kinetics curve,thermodynamic curve and other experimental results, reveal the adsorption kinetics mechanism of cohesive soils, establish the control theory of adsorbed water. The Monte Carlo simulation of cohesive soil adsorbed bound water will be used. The interaction mechanism of clay mineral, surface charge, cations and adsorbed water will be established. the research results can be used to predict and prevent for the engineering problems caused by the adsorbed water, and promote the basic theory development of soil properties science, soil mechanics, engineering geology and soil science.

 

单层水分子吸附结构示意图

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