土钉长度的时域电磁反射检测方法  

Time-domain electromagnetic reflection method for measuring the length of soil nails

作　　者：邹学琴 叶涛 顾盛[2] 郝路 潘永东[3] ZOU Xueqin;YE Tao;GU Sheng;HAO Lu;PAN Yongdong(Shenzhen Futian Construction Engineering Quality Testing Center,Shenzhen 518048,China;Kunshan Construction Project Quality Testing Center,Kunshan 215337,China;School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China;College of Physics and Electronic Information Engineering,Zhejiang Normal University,Jinhua 321000,China)

机构地区：[1]深圳市福田区建设工程质量检测中心,深圳518048 [2]昆山市建设工程质量检测中心,昆山215337 [3]同济大学航空航天与力学学院,上海200092 [4]浙江师范大学物理与电子信息工程学院,金华321000

出　　处：《无损检测》2025年第1期33-39,共7页Nondestructive Testing

摘　　要：时域电磁反射法因具有非侵入性与高灵敏度而被广泛应用于无损检测中,且已在土钉长度检测中展开应用。首先,分析时域电磁反射法基本原理;然后,分别针对土钉半径、平行导体距离、注浆材料、端部连通条件和激励主频等参数的不同情况进行数值模拟计算,分析电磁波在混凝土和土钉之间的传播特性,判断时域电磁反射法检测土钉长度的影响因素;最后,进行土钉长度检测试验,并对不同土钉长度和中间介质的检测结果进行对比。试验结果表明,影响时域电磁反射法检测土钉长度的因素为注浆材料,而土钉半径、平行导体距离、端部连通条件和激励主频对检测结果均无影响。The Time-Domain Electromagnetic Reflection(TDR)method is widely used in nondestructive testing due to its non-invasive and high sensitivity and it has now been applied in the measurement of soil nail lengths.Firstly,the basic principle of the TDR method was analyzed.Then,numerical simulations were conducted for different scenarios including variations in soil nail radius,distance to parallel conductors,grouting materials,end connectivity conditions and excited main frequency.The propagation characteristics of electromagnetic waves between concrete and soil nail were analyzed,and the factors affecting the length of soil nails using time domain electromagnetic reflectivity method were determined.Finally,experiment on soil nail length measurement were conducted,the detection results of different soil nail lengths and intermediate medias were compared.The results indicated that the material of the grouting was a significant factor affecting the accuracy of soil nail length measurement using the TDR method,while the soil nail radius,distance to parallel conductors,end connectivity conditions and excited main frequency had no effect.

关 键 词：时域电磁反射法 注浆料 土钉 电磁波 混凝土 

分 类 号：TG115.28[金属学及工艺—物理冶金]