煤层可作为高频电磁波的导波层,无线电波透视技术适用于工作面煤层内的地质构造探测。目前无线电波透视法通常采用单一频率进行探测,在煤层工作面勘探过程中常存在频率选择不当和探测精度不足等方面问题。为此,提出了双频透射无线电波勘探方法。基于理论分析,利用双频透视场强数据和衰减系数参数,推导了基于双频无线电波测量数据的煤岩介质吸收因子γ of coals based on the measurement data of dual-frequency radio waves. Furthermore, using the finite element numerical simulation method, this study simulated and analyzed the conditions of coal seams bearing no anomalous geological structures and those containing faults. The experimental results show that the absorption factor caculated by dual-frequency method is more sensitive to the geological anomalies of coal seams, verifying the effectiveness of the dual-frequency transmission radio wave-based exploration method. The comparison between the field experimental data and the mining drilling results also verified that the absorption factor γ exhibited better responses to geological anomalies than the single-frequency attenuation coefficient. The experimental results show that the dual-frequency transmission radio wave-based method can improve the detection effects of geological anomalies within coal seam mining faces, providing a new method and idea for radio wave-based fine-scale exploration and the ascertainment of mine geology. 相似文献
