均质土坝内病害探地雷达探测研究

Study on the ground penetrating radar detection in homogeneous earth dam

从波动方程出发,研究了探地雷达电磁波在导电介质中的传播特征。按照均质土坝设计规范,对试验坝土料进行了物理试验,确定了土料的含水率及压实度。制作了均质土坝物理模型,设置了不同病害以进行对比分析。对试验坝病害进行了物理模型探测试验,通过Radan7软件处理生成了不同病害模型的不同深度切片图及三维坐标图像。对比分析不同病害下的雷达探测图像,研究了其图像特性,据此建立的雷达探测数据及病害图谱特性分析方法,有利于均质坝GPR解译和工程实践。

The propagation characteristics of ground-detecting radar electric wave in conductive medium are studied with the wave equation.The physical experiments were carried out on the soil of the test dam to determine the moisture content and compaction degree of the fill material according to the design specification of homogeneous earth dam.A physical model of homogeneous earth dam was manufactured and different diseases were set up for comparative analysis.Physical model detection tests were carried out on the test dam diseases,and different depth slice maps and three-dimensional coordinate images of different disease models were generated by Radan7 processing program.The radar detection images under different diseases are compared and analyzed,and the image characteristics are studied.The radar detection data and disease spectrum analysis methods established by this method are beneficial to the GPR interpretation and engineering practice of homogeneous dam.