无损检测技术在路基下伏障碍物检测中的应用

Application of Nondestructive Testing Technology in the Subgrade Underlying Obstacle Detection

通过正演模拟分析和实际案例分析验证了地质雷达法和高密度电法等无损检测方法在探测地下障碍物时有良好的探测效果。基于集成软件中的有限差分法,分别做出地下障碍物的正演模拟结合实际案例分析得到,地质雷达法探测柱状异常的综合反映为从上至下异常体电磁波强反射,表现为沿异常同相轴强反射与两侧介质断开,且异常界面明显;高密度电法探测柱状异常的综合反映为低阻椭圆状电性结构,随长宽比的变化电性结构而发生变化。综合论证了无损检测技术在路基下伏障碍物检测是必不可少的探测手段。

Through forward modeling analysis and actual case analysis verified the nondestructive testing methods,such as GPR method and multi-electrode resistivity method has good detection effect in detecting the underground obstacles.Based on the finite difference method,the integrated software separately underground obstacles of forward modeling based on the actual case analysis,abnormal GPR method to detect cylindrical comprehensive reflection of electromagnetic waves from top to bottom abnormal body strong reflection,as along the sides of their abnormal in phase axis strong reflection and medium disconnect,and abnormal interface;multi-electrode resistivity method to detect cylindrical abnormal comprehensive reflection of low impedance elliptical electrical structure,along with the change of aspect ratio and electrical structure change.Comprehensive demonstrates the nondestructive testing technology in subgrade underlying obstacle detection is an essential means of detection.