探地雷达对道路空洞修复效果探测的应用

Application of ground penetrating radar in detecting the repair effect of road cavity

随着各大城市道路空洞探测项目的实施,探测成果丰硕,有效减少了道路塌陷事故,也推动了空洞修复技术的发展,但修复后的空洞仍频繁出现沉陷甚至塌陷事件,主要原因是空洞修复技术的不足,当时又无法得知修复效果。为保证空洞修复后不再出现新空洞,空洞修复后的雷达探测成为检测修复效果的有效手段。探地雷达由于其分辨率高、速度快、成果直观且可实时反应地下情况,是目前常用的探测手段。本文首先阐述了目前普遍使用的空洞修复技术,并对修复后空洞进行探地雷达正演模拟,最后结合工程案例,分析探测效果。结果表明,探地雷达对大多数修复技术的效果探测准确可靠,但对高聚物注浆修复效果评价需结合FWD(落锤式弯沉仪)等其他无损检测技术,本文所提出的探测方法可为同行开展相关工作提供借鉴。

With the implementation of road cavity detection projects in major cities,the detection results have been fruitful,effectively reducing road collapse accidents and promoting the development of cavity repair technology.However,the repaired cavities still frequently experience subsidence or even collapse events,mainly due to insufficient cavity repair technology,but the repair effect cannot be known.To ensure that no new cavities will appear after cavity repair,the radar detection after cavity repair has become an effective means to check the repair effect.Ground penetrating radar(GPR)is currently the most commonly used detection method due to its high resolution,fast speed,intuitive results and real-time ability to reflect underground conditions.This article firstly elaborates on the commonly used cavity repair techniques and conducts GPR forward modeling of the repaired cavities.Finally,combined with engineering cases,the detection effectiveness is analysed.The results show that ground penetrating radar is accurate and reliable in detecting the effectiveness of most repair technologies,but the evaluation of the effectiveness of polymer grouting repair needs to be combined with other non-destructive testing technologies such as FWD(falling weight deflectometer).The detection method proposed in this article provides the reference for colleagues to carry out related work.