基于流场法的渗漏路径探测方法研究

Study on detection method of leakage path based on flow field

流场法是一种用于渗漏点探测的高效、精确的方法,已广泛应用于水利工程渗漏点探测并取得了良好的效果。本文基于流场法渗漏点探测的理论基础,对渗漏路径探测的理论进行分析,研究制定出渗漏路径探测的具体方法。结合某水电站工程进行探测试验,经人工加载电流场后,在钻孔内不同深度位置均可测量得到一个电势,对比灌浆处理前、后分别测得的电势曲线,可见灌浆前的高电势异常区的电势降为背景值或接近背景值,推测高电势异常为渗漏路径位置的直观反映,表明该方法是渗漏路径探测的一种有效方法。

Flow field method is effective and accurate to detect leakage points which has been widely used in hydraulic engineering and has achieved good results. Based on the leakage detection theory of flow field method, the leakage path detection is discussed and the specific method to detect the leakage path is proposed. A case study of the leakage detection in a hydropower project is carried out. The electric potential can be measured at different depth in the borehole of an artificial current field. Comparing the potential curves measured before and after the grouting, it can be seen that the high potential anomaly zone before grouting is reduced to the background value or close to the background value, which inferred that anomaly area is the visual reflection of the leakage. The method is an effective way to detect leakage path.