实验室煤体复电阻率测试旨在提供可靠的复电阻率数据,为进一步现场应用基础研究。影响煤体复电阻率测量精度的因素众多,其中电极板为最重要的因素之一,电极材料的选择、极板的厚度和大小都会对煤体复电阻率测量产生影响,因此电极板的变化对测量参数的准确性有重要意义。本文通过选用导电性较好的紫铜材料作为极板,对三种不同厚度的极板材料进行了复电阻率测量,分析极板厚度对激发极化效应的影响,测试了直径为1cm、2cm、3cm、4cm、5cm5种大小极板对煤体复电阻测量的影响,并使用Cole-Cole模型进行数据拟合。得出结论如下：(1)极板本身的极化效应和极板与煤样端面贴合程度是影响煤样复电阻测量误差的主要因素,三种极板材料中导电铜纸误差最小；(2)对同一个煤样而言极板面积变化仅对复电阻率幅值有较大影响,对煤样激发极化的影响可以忽略。本文研究考虑电极材料和接触面积的重要性,提高了实验室煤样的复电阻率测量精确性,为煤体复电阻率实验方法研究和复电阻率法的现场应用奠定了基础。

The purpose of complex resistivity measurement of coal in laboratory is intended to provide reliable data of complex resistivity for further field application. There are many factors that affect the measurement accuracy of coal complex resistivity, among which electrode plate is one of the most important factors. The selection of electrode material, thickness and size of electrode plate will affect the result of coal complex resistivity measurement, so the change of electrode plate is of great significance to the accuracy of measurement parameters. In this paper, the complex resistivity of three kinds of electrode materials with different thickness is measured by using the copper material with better conductivity as the electrode plate. The influence of the thickness of the electrode plate on the induced polarization effect is analyzed. The influence of five kinds of electrode plates with diameter of 1cm, 2cm, 3cm, 4cm and 5cm on the measurement of the complex resistivity of coal is tested. The Cole-Cole model is used for data fitting. The conclusions are as follows: (1) the polarization effect of the electrode plate itself and the bonding degree between the electrode plate and the end face of the coal sample are the main factors affecting the measurement error of the complex resistance of the coal sample, and the error of the conductive copper paper is the smallest among the three electrode materials; (2) for the same coal sample, the change of the area of the electrode plate only has a great influence on the amplitude of the complex resistance, and the influence on the induced polarization of the coal sample can be ignored. In this paper, the importance of electrode material and contact area is considered to improve the accuracy of the measurement of the complex resistivity of coal samples in the laboratory, which lays a foundation for the research of the experimental method of the complex resistivity of coal and the field application of the complex resistivity method.

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国家自然科学基金(51704101)、河南省重点科技攻关项目(182102310780、192102310199)、中国博士后科学基金(65批：2019M652535)、河南省高等学校重点科研项目计划（19A520024）