基于高频探地雷达的超深电力隧道工作井结构损伤检测方法研究

Structural Damage Detection Method of Ultra-deep Electric Well of Power Tunnel Based On High Frequency Ground Penetrating Radar

软土地区超深电力隧道工作井承受着较大的水土压力和荷载,在经过长期服役后,往往会出现各类病害如变形、裂缝、渗漏水等,而电力隧道工作井具有较复杂的水土环境与电磁干扰等不利因素,采用正常的巡查手段很难在早期发现结构的损伤与病害,因而对结构的正常服役与安全带来了极大的挑战。以上海杨树浦电厂越江隧道1号工作井为研究对象,采用同济自研的高频探地雷达对结构长期的渗漏进行了全面细致的检查,并对雷达数据进行了去噪和解析,分析了产生结构病害的原因以及后续的封堵和修复措施。结果表明:采用高频探地雷达能够较好地捕捉到地下结构的脱空腔体与地下水分布情况,给后期的维修指明了方向。本研究还可为今后类似的结构病害检测提供借鉴。

Ultra-deep electric power wells of power cable in soft soil areas are subjected to large soil and water pressures and loads,and after long-term service,various damages such as deformation,cracks,seepage and water leakage often occur.However,electric power wells are faced with unfavorable factors such as complex soil and water environment and electromagnetic interference,and it is difficult to detect structural damages early by normal inspection methods.Therefore,the normal service of the structure and the safety of the structure have brought great challenges.Taking the No.1 working well of cross-river tunnel of Yangshupu Power Plant in Shanghai as the research object,the high-frequency ground penetrating radar(GPR)developed by Tongji University was used to conduct a comprehensive and detailed inspection on the long-term leakage of the structure,denoising and analyzing the radar data,and analyzing the causes of the structural diseases as well as the subsequent plugging and repair measures.The use of high frequency GPR can better capture the cavity and groundwater distribution of underground structure,which points out the direction for later maintenance,and can provide reference for similar structural damage detection in the future.