多源干扰条件下瞬变电磁法电性响应规律研究  

Study on the electrical response law of transient electromagnetic method under multi-source interference conditions

作　　者：牟义 邱浩[1,2] 牛超 游超[1,2] 张林[1,2] 张永超 MU Yi;QIU Hao;NIU Chao;YOU Chao;ZHANG Lin;ZHANG Yong-chao(Mine Safety Technology Branch of China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute),Beijing 100013,China;College of Geology and Environment,Xi'an University of Science and Technology,Xi'an 710054,China)

机构地区：[1]煤炭科学技术研究院有限公司安全分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院),北京100013 [3]西安科技大学地质与环境学院,西安710054

出　　处：《地球物理学进展》2019年第6期2493-2502,共10页Progress in Geophysics

基　　金：国家自然科学基金青年基金项目资助(51704162);国家自然科学基金青年基金项目资助(51804162)联合资助;国家科技重大专项资助项目(2016ZX05045001-004)

摘　　要：本文通过采用瞬变电磁法对井下及地面常见干扰因素进行探测试验,从单一干扰因素(综掘机、镏子、锚网、钢管等铁器)到多源干扰因素(铁器、电力不同组合)进行了系统的瞬变电磁场特征分析,通过对比分析归一化感应电压、视电阻率等电磁场参数,寻找干扰规律.结果表明:巷道内单一铁器(综掘机、镏子、锚网、钢管等铁器)在瞬变电磁探测中是一种"高压低阻"响应,超前探测时,综掘机建议远离探测位置10 m之外,发射-接收线圈边缘离镏子至少0.5 m、距离锚网至少0.6 m,尽量将发射-接收线圈法线方向及线圈边缘远离钢管方向;多源干扰条件下,一般铁器尺寸大的比尺寸小的影响范围要大,阻值更低、归一化电压更高,呈现"高压低阻"特征,铁器使曲线跳点减少、曲线更圆滑,电力一般比铁器影响范围及程度更大,电力影响使曲线跳点增多,起伏增大,阻值更高、归一化电压更低,呈现"低压高阻"特征.In this paper,the transient electromagnetic method was used to detect common disturbance factors in underground and ground,the characteristics of transient electromagnetic field of the system were analyzed from single disturbance factors(such as comprehensive excavator,scraper conveyor,anchor nets,steel pipes and other irons)to multi-source interference factors(iron and electric power combinations).The interference law was found by comparing and analyzing the electromagnetic field parameters such as induced voltage and apparent resistivity.Result is indicated:A single iron(a comprehensive excavator,scraper conveyor,anchor net,steel pipe,etc.)in the roadway was a kind of"high-voltage and low-resistance"response in transient electromagnetic detection,the comprehensive excavator was recommended to be 10 m away from the detection position,the edge of the transmitting-receiving coil was at least 0.5 m away from the scraper conveyor and at least 0.6 m away from the anchor net,trying to make the normal direction of the transmitting-receiving coil and the edge of the coil away from the direction of the steel pipe;Under the condition of multi-source interference,the size of the large iron was larger than that of the small size,the resistance was lower,the resistance was lower,and the normalized voltage was higher,it had the characteristics of"high pressure and low resistance",the iron maked the curve jump point decrease,and the curve was smoother.The power was generally larger than the range and extent of the iron,the influence of the power maked the curve jump point increase,the fluctuation increases,the resistance value was higher,and the normalized voltage was lower,showing the characteristics of"low voltage and high resistance".

关 键 词：瞬变电磁法 铁器干扰 电力干扰 多源干扰 归一化感应电压曲线 视电阻率曲线 

分 类 号：P631[天文地球—地质矿产勘探]