基于电化学阻抗谱高频极值的土石混合体结构特征研究

Study on the characteristics of the soil-rock mixture structure based on the high-frequency extremum of the electrochemical impedance spectroscopy

为了对土石混合体在不同基础材料和不同尺度下研究的统一性做出初步的探索,采用电化学阻抗谱方法,对由理想材料构成的土石混合体进行研究,通过在宏观角度上对土石混合体系统中的含水率、土石比、石粒粒径3个材料指标进行控制调节,取得其电化学阻抗谱测试结果的表现规律。以电化学阻抗谱高频极值为基点,对其规律进行表述和进一步研究。从而初步构建出以电子通过性为具体特征的微观尺度与宏观尺度下材料指标之间的映射规则。提出了联结程度、阻抗极值曲线和最优阻抗极值点的等一系列概念和工具,分析得出含水率对于土石混合体结构的基础性作用,土石比的影响呈现为2种因素交叉主导的态势,随石粒粒径的有序变化,其高频极值循曲线绕行。上述研究成果对土石混合体结构特征的研究具有一定的参考价值。

In order to make a preliminary exploration of the unity of the study of soil-rock mixture under different basic materials and different scales,the electrochemical impedance spectroscopy method was used to study the soil-rock mixture composed of ideal materials.Through the macroscopical adjustment of the three materials indexes of the rock-soil mixture system of water content,soil-rock ratio,and particle size,the rules of the electrochemical impedance spectroscopy results were obtained.Based on the high-frequency extremum of the electrochemical impedance spectroscopy（EIS）,its regularity was described and further studied.Thus,a preliminary mapping was made between the electron passability at the micro-scale and the material indexes at the macro-scale.A series of concepts and tools such as coupling degree,curve of the impedance？s extremum（CIE）,optimal point of CIE were put forward.The basic effect of water content on the structure of soil-rock mixture was obtained,and the influence of soil-rock ratio is dominated by two factors.Especially with the orderly change of the particle size,its high-frequency extremum moved along curved path.These above research results have some reference value to the study of the structural characteristics of soil-rock mixture.