RIS探地雷达在地下管道探测的数值模拟及应用

摘要

For the problem of ground penetrating radar (GPR) detection in underground pipelines,the forward simulations on metal pipes with different diameters and underground cavities were carried out respectively by the two-dimensional finite difference simulation method.The radar sections of both metal pipe and underground cavity are characterized by a hyperbola,and the apex position of the hyperbola indicates the depth of the abnormal body.And the hyperbolic reflection features by metal pipes is obvious and the opening increases with the diameter of pipes,the reflection feature by underground cavities is weak and the hyperbola is comparatively vague,furthermore,almost no superimposed reflection feature exists.Finally,the ground penetrating radar is applied to a certain survey and the underground anomalies are recognized on the basis of the radar section reflection features.%针对探地雷达在地下管道方面存在的探测问题,采用二维有限差分模拟方法,分别对不同管径的金属管以及地下空洞进行了正演模拟.金属管和地下空洞的雷达剖面均表现为双曲线特征,且双曲线的顶点位置即指示异常体埋深位置.其中金属管的双曲线反射特征较为明显,开口随管径的增大而逐渐增大,地下空洞的反射特征较弱,双曲线不明显,且几乎无叠加反射特征.最后用RIS探地雷达对某一测区进行了实际应用,并依据雷达剖面反射特征对地下异常进行了判识.