双分量广域电磁法在深埋隧洞工程勘察中的应用  

Application of the Two-Component Wide-Field Electromagnetic Method to Engineering Survey of A Deep Tunnel

作　　者：张林成 周聪[2] 汤井田[3] 原源 蒋奇云[3] 李广 黄凤林 李广场 ZHANG Lincheng;ZHOU Cong;TANG Jingtian;YUAN Yuan;JIANG Qiyun;LI Guang;HUANG Fenglin;LI Guangchang(Hunan City University,College of Information and Electronic Engineering,Yiyang,Hunan 413000;Engineering Research Center of Nuclear Technology Application(East China Institute of Technology),Ministry of Education,Nanchang,Jiangxi 330013;Key Laboratory of Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Central South University,Changsha,Hunan 410083;Zhejiang Huadong Engineering Safety Technology Co.,LTD,Hangzhou,Zhejiang 311122)

机构地区：[1]湖南城市学院信息与电子工程学院,湖南益阳413000 [2]核技术应用教育部工程研究中心,江西南昌330013 [3]中南大学有色金属成矿预测教育部重点实验室,湖南长沙410083 [4]浙江华东工程安全技术有限公司,浙江杭州311122

出　　处：《地质与勘探》2022年第4期857-864,共8页Geology and Exploration

基　　金：国家自然科学基金(编号:41904072,41904073,41904076);湖南省自科基金(编号:2021JJ40024);湖南省教育厅优秀青年项目(编号:20B111);核技术应用教育部工程研究中心开放基金项目(编号:HJSJYB2021-18);江西省教育厅科学技术研究项目(编号:GJJ210703)联合资助。

摘　　要：广域电磁法是一种高效、抗干扰能力强的电磁勘探方法,常规E-Ex观测方式仅处理单分量信息,不利于复杂构造区勘探应用。开展E-Ex及E-Ey双分量观测与解释,是提高勘探精度的有效途径。为测试双分量广域电磁法的应用效果,本文以西南地区卡拉水电站深埋隧洞工程勘察为例,阐述和说明了双分量广域电磁法的基本原理、数据采集方案、数据处理及反演方法,获得了目标洞线剖面的双分量广域视电阻率及其二维反演模型;结合地质资料,对反演模型进行了推断解释。结果表明,双分量广域电磁法反演模型准确反映了目标剖面的主要电性结构,较好揭示了断裂及破碎带的位置和倾向;与常规E-Ex单分量观测相比,E-Ex及E-Ey双分量广域电磁法可在少量增加施工成本的基础上提供双倍的观测数据量,具有高效及可用信息多等优点,有利于提高复杂构造区勘探精度,是深埋隧洞勘察的一种有效手段。The wide-field electromagnetic method is a new electromagnetic exploration method with high efficiency and strong anti-interference ability.The conventional E-Ex observation methods can only handle single-component information,which are not conducive to exploration in complex structural areas.The E-Ex and E-Ey observation and interpretation experiments are an effective way to improve exploration accuracy.In order to test the application effects of the two-component wide-field electromagnetic method,this work investigated a deep buried tunnel engineering at the Kala hydropower station in southwest China,and described the data acquisition,processing and inversion of this case study.The wide-field apparent resistivity and the two-dimensional inversion model of the tunnel line section were obtained.In combination with drilling and engineering geological data,the inversion model was inferred and interpreted.Results show that the two-component wide-field electromagnetic inversion model accurately reflects the main electrical structure of the target profile,and can better reveal the location and tendency of faults and fracture zone.Compared with the conventional E-Ex observation,the E-Ex and E-Ey observation and interpretation methods can provide double amount of observation data on the basis of a small increase in construction cost,and show high efficiency and more available information.It is beneficial to improve the exploration accuracy of complex structural areas and is an effective means of deep tunnel exploration.

关 键 词：电磁勘探 双分量广域电磁法 电性结构 工程勘察 深埋隧洞 

分 类 号：P631[天文地球—地质矿产勘探]