隧道空间内金属体对瞬变电磁法探测结果影响研究  

Interference of Metal Materials in Tunnels on the Detection Results by Transient Electromagnetic Method

作　　者：刘宗辉[1,2] 黄文斌 黄俊评 吴恒[1,2] 王业田[1,2] 周东[1,2] 

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,南宁530004 [3]梧州市苍海建设开发有限公司,梧州543000

出　　处：《现代隧道技术》2016年第4期116-122,142,共8页Modern Tunnelling Technology

基　　金：国家自然科学基金项目(51178124);广西科技计划重点项目(桂科攻10124006-10)

摘　　要：文章采用现场探测试验与室内物理模拟试验相结合的方法,研究了隧道空间内开挖台车与钢拱架等金属体对瞬变电磁法探测结果的影响规律。试验结果表明:隧道掌子面后方开挖台车与钢拱架等金属体均对瞬变电磁法探测结果有干扰,且随着金属体与探测线框距离的增大,其干扰系数呈指数减小,物理模拟与现场试验所反映的规律基本吻合。金属体干扰系数与隧道探测目标信号强度有关,在隧道掌子面后方金属体位置不变的情况下,掌子面前方低阻异常响应值越大,后方金属体干扰系数越小。现场采用瞬变电磁法进行隧道地质超前预报时,为减少金属体的干扰,应将开挖台车撤离掌子面至少30 m,同时探测线框距边墙至少1 m。Combining field detection with physical simulation, it studied the metal intedrence from drilling jumbo, steel arch, ere on the detection results by transient electromagnetic method. The results show that： 1） the metallic body behind the working f＇ace has some interlerence on tile （/etection results by transient electromagnetic method, of which the interference coefficicnl will decrease with an increase of the distance between the metallic body and the detection line, in（ticating that the results from physical simulation agree well with the ones from field test; 2） the interference coeffficient has something to do with the signal strength of detection target, i.e. with a constant location of Ihe melallic body, its interference coeffiicient will decrease with an increase of the low-resistant anomah）us value ahead of working face; 3） to reduce the metal interference during the advance geological forecast, the drilling jumbo shall be at least 30 m away from the working lace and the detection line shall be at least 1 m away from the sidewall.

关 键 词：隧道 地质预报 瞬变电磁法 金属体干扰 物理模型试验 现场试验 

分 类 号：U452.1[建筑科学—桥梁与隧道工程]