综合物探法探测堤坝白蚁隐患的关键技术研究

白蚁蚁穴一直以来都是危及堤防安全的重要隐患,目前借助先进的无损探测技术可快速、高效地探明隐患位置和特征。采用探地雷达法和高密度电阻率法等综合物探技术对堤坝白蚁巢穴进行探测,首先通过计算地下介质速度,进而开展蚁穴特征正演分析和实测图像解译,最后通过开挖验证,探明了主巢3个和副巢、空腔及蚁道若干,分析结果表明综合物探技术可行,采用联合诊断方法准确度高。通过现场实地测试,综合物探技术在探测堤坝白蚁巢工作时效率高,可基本确定蚁巢的地下空间位置和规模大小,是目前探测白蚁巢穴、保护堤坝理想的新方法和新技术。

Key technology research for detecting termites in dykes and dams by integrated geophysical method

The termite nest has always been an important risk to endanger the safety of embankments. With the current advanced nondestructive detection technology, the location and characteristics of hazards would be quickly and efficiently ascertained. The termite nests in such dykes and dams are detected by the integrative geophysical methods of ground penetrating radar(GPR) and high density resistivity(HDR). Based on the media speed of underground, the characteristics of the forward analysis and the observed image interpretation on the termites nests are obtained. Through certificating of excavation, three main termite nests, several deputies and some of the ant nests are detected, and the analysis results show that the detection accuracy is much higher. Finally, through data collection and technology refining, the integrative geophysical method, which is formed for detecting termite nests, is found to be convenient and time-saving. The analysis results also show that the integrated geophysical technology is a technically feasible and highly accurate diagnostic method. This technology provides a new technical support for the detection and prevention of dam termites. The on-site field testing shows that the integrated geophysical techniques to detect termite nests in dams can work in aging rate. It can basically determine the location and size of the underground nests, which is a new way to protect the dykes and dams.