基于车载探地雷达的重载铁路道床脏污指数提取研究  

Research on Extraction of Track Bed Fouling Index of Heavy-Haul Railway Based on Vehicle-Mounted Ground Penetrating Radar

作　　者：朱德兵[1,2] 高堤 秦怀兵 孔波[3] 肖志宇 ZHU Debing;GAO Di;QIN Huaibing;KONG Bo;XIAO Zhiyu(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory Metallogenic Prediction of Nonferrous Metals,Ministry of Education,Changsha 410083,China;Shuohuang Railway Development Co.,Ltd.,Suning 062356,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]有色金属成矿预测教育部重点实验室,长沙410083 [3]朔黄铁路发展有限责任公司,河北肃宁062356

出　　处：《铁道标准设计》2022年第9期31-37,共7页Railway Standard Design

基　　金：国家自然科学基金项目(42074161)。

摘　　要：车载探地雷达信号响应谱的振幅和包络特征可以间接关联有砟轨道道床脏污状态,路基、桥梁、隧道等3种线路环境下检测信号存在差异,由雷达信号提取道床脏污指数时需要求同存异。针对现有道床脏污率提取算法仅用于路基雷达数据的不足,需根据全线不同线路雷达信号特征改进道床脏污指数计算方法。通过设置合理的铁路路基模型,数值模拟路基、桥梁、隧道3种线路环境上不同脏污程度时的雷达信号响应,并在相应线路下进行现场雷达测试和挖验试验。结果表明:路基、桥梁、隧道3种线路环境下,以功率谱曲线振幅最大值或包络面积构成的道床脏污指数与道床脏污率均呈正相关,且计算桥梁线路下雷达信号功率谱响应时需截断时间窗口中的梁体反射信号,隧道线路下无需截断仰拱反射信号,可类似于路基线路进行计算,该结果为利用探地雷达对全线道床脏污水平评估和预测奠定了重要基础。The amplitude and envelope characteristics of the vehicle-mounted ground penetrating radar signal response spectrum can be indirectly related to the dirty state of the ballast track bed.There are differences in the detection signals under the three line environments of roadbed,bridge,and tunnel.It is necessary to extract the dirt index of the track bed from the radar signal by seeking common ground while reserving differences.In view of the shortcomings that the existing track bed dirt rate extraction algorithm is only used for roadbed radar data,it is necessary to improve the calculation method of track bed dirt index based on the characteristics of different line radar signals on the whole line.By setting up a reasonable railway subgrade model,this paper numerically simulates the radar signal response of roads,bridges,and tunnels with different levels of pollution under the three line environments,and conducts field radar tests and digging tests on the corresponding lines.The results show that the dirt index of the track bed,which is composed of the maximum amplitude of the power spectrum curve or the envelope area,is positively correlated to the dirt rate of the track bed under the three line environments of roads,bridges,and tunnels;when calculating the power spectrum response of the radar signal on the bridge line,the beam reflection signal in the time window needs to be cut off,and there is no need to cut off the inverted arch reflection signal on the tunnel line,and it can be calculated similarly to the roadbed line.This result lays an important foundation for the use of ground penetrating radar to evaluate and predict the dirt level of the track bed on the whole line.

关 键 词：重载铁路 探地雷达 道床脏污 脏污检测 脏污指数 

分 类 号：U216.3[交通运输工程—道路与铁道工程]