瞬变电磁测试线圈改进及其在长三角城市地质探测中的应用  

Improvement of transient electromagnetic test coil and its application in urban geological exploration in the Yangtze River Delta

作　　者：周昊钰 胡雄武[1] 倪圣军 ZHOU Haoyu;NI Shengjun(School of Earth and Environment,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Anhui Huizhou Geology Security Institute Co.,Ltd.Hefei,Anhui 230088,China)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南32001 [2]安徽惠洲地质安全研究院股份有限公司,安徽合肥230088

出　　处：《安徽地质》2022年第4期337-342,共6页Geology of Anhui

基　　金：安徽省自然科学基金资助项目“坑道瞬变电磁全程视电阻率成像方法”(编号:1808085QD102)资助。

摘　　要：长三角地区城市经济、人口的不断增长有力推动了城市地下空间的开发,精准地质探测是其地下工程建设的重要保障。本文简要介绍了长三角地区地下空间的发展现状、影响因素和主要的地质探测手段,表明瞬变电磁法在城市地质探测中具有较大的市场潜力和社会需求。考虑到现有瞬变电磁法存在较大的浅层勘探盲区,本文设计了一种改进型瞬变电磁线圈,给出了相应的绕制方法及理论依据;与传统中心装置线圈的对比实验结果表明,利用改进型线圈可促使感应电动势有效分辨时间大幅提前,对浅层地电信息的响应能力增强,有效减小了浅层勘探盲区。现场试验结果进一步表明了改进型线圈的可靠性和优越性。The continuous growth in urban economy and population in the Yangtze River Delta region has strongly promoted the urban underground space development,and accurate geological exploration is an important guarantee for underground engineering construction.This paper briefly introduces the development status of underground space,the influencing factors and the main means of geological exploration in the Yangtze River Delta region,and confirms that transient electromagnetic method(TEM)has great market potential and social demand in urban geological exploration.Considering that the existing transient electromagnetic method has a large shallow exploration blind area,an improved TEM coil is designed in this paper,and the corresponding winding method and theoretical basis are given.Compared with traditional central coil,the experimental results show that the improved coil can greatly advance the effective resolution time of induced electromotive force,enhance the response ability to shallow geoelectric information,and effectively reduce the shallow exploration blind area.The field test results further demonstrate the reliability and superiority of the improved coil.

关 键 词：城市地质探测 瞬变电磁法 线圈改进 有效分辨时间 

分 类 号：P631[天文地球—地质矿产勘探]