高密度电法在某水库高阻地裂缝探测中的应用

Application of High Density Electrical Method in Crack Detection of Reservoir with High Resistance

南水北调中线工程在建调蓄水库库区发育有地裂缝,可能会影响建成后水库正常运行,为查明裂缝的发育情况,在地裂缝区域开展高密度电法工作,并结合地质资料将采集资料进行合理解释。地裂缝表现出的电阻率异常与地下水有密切关系,宜采用高密度电阻率法进行探测。野外采集工作采用温纳装置和MNB装置,布置三条高密度测线。将野外采集到的高密度电阻率法数据进行处理反演,最终得到电阻率反演图像。解释结果表明,高密度电法在探测高阻地裂缝时效果明显。

In the middle route of south-to-North Water Transfer project, ground cracks are developed in the reservoir area of a regulation and storage reservoir under construction, which may affect the normal operation of the reservoir after completion. In order to find out the development of the fractures,high-density electrical method is carried out in area of ground fractures, and the collected data are reasonably interpreted in combination with geological data. The resistivity anomaly of ground fissure is closely related to groundwater, so the high-density resistivity method should be used to detect. Wenner device and MNB device were used for field collection, and three high-density measuring lines were arranged. The high density resistivity method data collected in the field are processed and inverted, and finally the resistivity inversion image is obtained. The interpretation results show that the high-density electrical method is effective in detecting high resistance ground cracks.