土坝自然电场的分布特点

Distributing characters of dam spontaneous electric field

土坝的自然电场中,由均匀和集中渗流产生的过滤电场起主导作用,它是探测土坝渗漏隐患的良好场源.笔者在国内外首先将土坝过滤电场整体上分解为均匀渗流的过滤电场和集中渗流的过滤电场两部分;同时,根据渗流产生的过滤电场的特征,沿土坝横断面将过滤电场分作入渗带、径流带和逸出带三部分;在此基础上,揭示了土坝过滤电场的基本特征,为应用自然电场检测土坝渗漏隐患技术研究提供了理论依据.

In spontaneous electric field of dam, Filtrating electric field created by uniform seepage flow and concentric seepage flow plays a dominant role. In the paper, the filtrating electric field of the earth dam is firstly divided into two parts. One is uniform seepage flow the other is concentric seepage flow. According to the characteristics of the filtrating electric field created by seepage flow along the cross section, the filtrating electric field consists of three parts. the permeable entrance zone, the runoff zone and the exit zone. It describes the basic characteristics of the filtrating electric field of the earth dam that provide a base for studying the technique in detecting the hidden seepage flow defect of the earth dam by the spontaneous electric field.