堤防渗漏隐患探测用瞬变电磁仪

TRANSIENT ELECTROMAGNETIC INSTRUMENT FOR DETECTING HIDDEN LEAKAGE DEFECTS IN LEVEES

堤防隐患探测是防洪减灾的重要内容。国内外多年试验研究表明 ,在诸多物探方法中 ,瞬变电磁法和高密度电法是探测堤防渗漏隐患最有效的方法。在研究瞬变电磁法应用于土坝和堤防渗漏的隐患探测过程中研制成功瞬变电磁仪 ,先后在 7座大坝和 3段堤防上进行渗漏隐患探测和定位。文中介绍了该仪器的工作原理、电原理以及设计中的若干技术问题。

The detection of hidden defects in levees is important in dike reconstruction. Many research and test results show that the transient electro-magnetic (TEM) method and the high-density electric method are the most efficient techniques for detecting hidden defects in levees among many geophysical techniques. The authors, who are engaged in the application of TEM method to the detection and positioning of hidden defects in earth-fill dams and levees, have developed a series of TEM instruments, which have been successfully applied to seven dams and three dikes. The principles of the instruments and some techniques for design are introduced in this paper.