探地雷达隧道衬砌病害检测正演模拟及应用  

The stimulation and application of GPR for detecting the defects in tunnel lining

作　　者：肖建平[1,2] 吴旭东[1,2] 柳建新[1,2] 王韵棋 

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,长沙410083 [2]中南大学地球科学与信息物理学院,长沙410083

出　　处：《物探化探计算技术》2017年第4期425-429,共5页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(41274122)

摘　　要：随着经济地发展,基础设施也得到了快速地发展,而隧道衬砌病害检测也受到越来越多的重视,探地雷达作为一种无损检测方法,在隧道衬砌检测中的应用十分广泛,且效率高、效果好。这里依据探地雷达的基本原理,基于时域有限差分正演模拟了隧道衬砌中含不同异常体的雷达图像特征。根据正演计算了空洞的尺寸,与理论模型对比验证了其准确性,并与实际检测图像作对比分析了隧道中病害的图像特征,为隧道衬砌病害识别提供借鉴。With the development of economy,the infrastructure in China has also been rapidly developed.Therefore,the method for detecting tunnel disease draws more and more attention.Since ground penetrating radar（GPR）is highly efficient as a non-destructive testing method,it has been widely applied in the detection of tunnel.In this paper,basing on the basic principle of GPR and Finite-Difference Time-Domain（FDTD）,the characteristics of the tunnel with different media and the steel bars in the lining is simulated.According to the results of stimulation,we calculate the size of the cavity and compare it with the theoretical model.As a result,the accuracy of our model is verified.Comparing with the actual image,we analyze the image features of the tunnel which lay a solid foundation for tunnel lining disease identification.

关 键 词：探地雷达 正演模拟 无损检测 衬砌病害 铁路隧道 

分 类 号：P631.4[天文地球—地质矿产勘探]