摘要
利用gprMax软件建立了煤岩介质雷达探测数值分析模型,研究了雷达超宽中心频率探测下煤层相对介电常数的变化特征,揭示了煤岩体相对介电常数与孔隙度、含水率及探测雷达中心频率间的相互影响关系。研究结果表明:煤层相对介电常数随着雷达探测中心频率升高而降低,低频率阶段下降较快,并随着中心频率进一步升高逐渐趋于定值;而煤岩相对介电常数随其孔隙度增大而减小、随含水率增加而增大,且含水率变化对煤岩相对介电常数影响更为显著,同时高频雷达波对煤岩介质含水率变化更加敏感。研究结果可为进一步推动雷达探测技术在煤岩界面识别中的应用提供基础。
In this study,the numerical model of radar detection for coal rock media was established by gprMax software.With this model,the variation characteristics of relative permittivity(RP)of the coal seam under radar detection with ultra-wide center frequency were studied,and the correlations between the RP of coal rock media and their porosity,water content,and radar center frequency were revealed.The results show that the RP of the coal seam decreases with the increase of radar center frequency.Specifically,it drops rapidly under a radar center frequency,and gradually approaches a fixed value with the continuous increase of radar center frequency.The RP of coal rock media falls with the increase of their porosity and rises with the increase of their water content,and the change in water content has a more significant effect on the RP.Meanwhile,the high-frequency radar wave is more sensitive to the change in water content.The research results can provide a basis for further promoting the application of radar detection technology in the identification of coal-rock interface.
作者
赵一鸣
相志
张农
戴京辰
ZHAO Yiming;XIANG Zhi;ZHANG Nong;DAI Jingchen(School of Mines,Key Laboratory of Deep Coal Resource Mining(CUMT),Ministry of Education,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2024年第6期1222-1229,共8页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(52274146)
国家重点研发计划项目(2023YFC2907600)。
关键词
雷达探测
中心频率
相对介电常数
变化特征
radar detection
center frequency
relative permittivity
variation characteristics
