基于探地雷达原位试验的空区探测研究

Study on Mined-out Area Detection Based on In-situ Test with Ground Penetrating Radar

选用露天矿山边坡已揭露的空区进行探地雷达原位试验,利用媒质的介电常数以及电磁波在地下介质中的反射和衰减特性,结合空区露头的实际情况以及钻探资料对探测结果进行识别解释;进而归纳出该矿山边坡不同地质条件下电磁波反射特征。将原位测试得到的规律应用到该矿山其他位置处的空区探测,并用现场钻孔和地质资料对其可靠性进行检验。研究结果表明,基于原位试验获取拟探测矿山的雷达资料解释电磁波在同一矿山空区及其围岩中的传播规律的方法可行。

In-situ testes with ground penetrating radar（GPR） were conducted for the known mined-out area under open pit slope. Utilizing permittivity of medium and attenuation characteristic of electromagnetic wave during its propagation in heterogeneous underground medium, detection data were identified and interpreted based on the field observation of out-crops in mined-out area and drilling data. Reflection characteristics of electromagnetic wave were induced under different geological conditions. Results obtained from in-situ test were applied to cavity detection for other site in the same mine, and the reliability of detection results was verified with the geological and drilling data. Results show that it is feasible to interpret the propagation of electromagnetic wave in the mind-out area and its surrounding rocks with obtained radar data based on in-situ tests.