河南理工大学学报（自然科学版）2025，Vol.44Issue(6)：147-155,9.DOI:10.16186/j.cnki.1673-9787.2023120030
不同含水饱和度煤体复电阻率各向异性及频散特征试验研究
Experimental study on anisotropy and dispersion characteristics of complex resistivity of coal with varying water saturation levels
摘要
Abstract
Objectives To analyze the effects of water saturation,anisotropy,and pore structure on the com-plex electrical resistivity of coal and its dispersion characteristics,an experimental study on the complex re-sistivity anisotropy and dispersion characteristics of coal with different water saturations was carried out.Methods Anthracite samples from Zhaoguer Mine were selected to investigate their electrical properties.The complex impedance magnitude Z(representing actual energy dissipation)and the imaginary component X(representing energy storage capacity within the medium)were measured along different directions and under varying water saturation conditions.Corresponding complex resistivity spectrum were derived and an-isotropy coefficients were employed to quantify the influence of water saturation and porosity on the anisot-ropy behavior of the coal samples.Results The results show that the complex resistivity of water-saturated coal exhibits frequency dispersion i.e.the magnitude varies with frequency.Specifically,the absolute val-ues of Z and X decrease with the increasing water saturation,and the imaginary component X shows a sig-nificant shift.As water saturation increases,the interfacial critical frequency shifts towards higher frequen-cies.The complex resistivity of coal exhibits pronounced anisotropy across different water saturation levels.The anisotropy coefficient increases with increasing water saturation and also rises with higher porosity,a behavior primarily attributed to the pore structure and its spatial distribution of the coal.Conclusions This study demonstrates a close linkage between water saturation,pore structure,and the anisotropy and frequency-dispersion characteristics of complex resistivity in coal.It provides experimental and theoretical basis for leveraging complex electrical properties to evaluate coal-seam pore structure,development state,and mineral composition and it offers practical implications for the prevention and control of coal-mine gas hazards.关键词
含水煤样/含水饱和度/电阻率各向异性/复电阻率/各向异性系数Key words
water-bearing coal sample/water saturation/resistivity anisotropy/complex resistivity/anisotropy coefficient分类
矿业与冶金引用本文复制引用
李东会,李子馨,李哲,黄亚平..不同含水饱和度煤体复电阻率各向异性及频散特征试验研究[J].河南理工大学学报（自然科学版）,2025,44(6):147-155,9.基金项目
国家自然科学基金资助项目(42274180) （42274180）
河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放基金项目(WS2023B13) （WS2023B13）
