堤防管涌通道微弱磁场信号检测技术  

Weak Magnetic Field Signal Detection Technology for DikePiping Channel

作　　者：周华敏 邬爱清[1] 肖国强[1] 宋俊磊 周黎明[1] 唐鑫达 ZHOU Hua-min;WU Ai-qing;XIAO Guo-qiang;SONG Jun-lei;ZHOU Li-ming;TANG Xin-da(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;School of Automation,China University ofGeosciences,Wuhan 430074,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]中国地质大学(武汉)自动化学院,武汉430074

出　　处：《长江科学院院报》2023年第8期112-119,共8页Journal of Changjiang River Scientific Research Institute

基　　金：中央级公益性科研院所基本科研业务费项目(CKSF2023316/YT);国家自然科学基金青年基金项目(41702321)。

摘　　要：渗流管涌是二元结构堤防最常见的破坏形式之一,高水位期准确查明堤防渗流通道对研究管涌演变规律和除险加固意义重大。基于此,提出堤防管涌通道微弱磁场信号检测技术,利用渗流水良导电性,向管涌口供人工电流,通过在堤防表面检测管涌通道导电回路产生的一次感应微弱磁场信号,快速判识管涌分布情况。采用数值计算分析管涌通道的弱磁场分布特征,针对微弱磁场信号检测难题,提出基于锁相放大法的弱磁信号提取方法和导线源同频干扰磁场校正方法,减少堤防起伏地形影响,增强微弱磁场信号能量。在鄱阳湖流域某堤防开展管涌探测现场试验,有效查明潜在管涌路径分布情况。该研究将有助于提高堤防管涌通道探测准确性,实现管涌险情的早发现早治理,为管涌险情应急处置提供技术支撑。Piping is a most common failure mode in binary structure dikes.Accurate detection of dike piping channels during high water levels is of great significance to the study of piping evolution and risk prevention and reinforcement project.This paper presents a technique for detecting weak magnetic field signals in embankment seepage channels.In the light of the conductivity of seepage water,an artificial electric current is supplied to the outlet of piping channel.By detecting the weak magnetic field signal generated by the conduction loop in the dike surface,the distribution of piping channel can be rapidly identified.The distribution characteristics of weak magnetic field in piping channel are analyzed by numerical calculations.To address the challenge of weak magnetic field signal detection,a method of extracting weak magnetic signal based on phase-locked amplification method and conductor source interference of the same frequency is proposed to reduce the influence of dike undulating terrain and enhance the energy of weak magnetic signal.Field tests of piping detection were carried out on a dike in Poyang Lake basin to find out the distribution of potential piping paths effectively.This study will contribute to improving the accuracy of detecting piping channel in dike,enabling early detection and mitigation of piping hazards,and providing technical support for emergency response of piping incidents.

关 键 词：堤防隐患 管涌通道 磁电阻率法 弱磁场特征 弱磁信号检测技术 

分 类 号：TU443[建筑科学—岩土工程]