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在海安地电观测台站对地表、井下地电观测进行了对比实验,分析研究了地表游散电流、金属管线、以及人工交/直电流对地表、井下地电观测的影响.研究表明:(1)在使用铅电极的情况下,井下地电观测的长期稳定性明显优于地表观测;垂直方向观测的抗干扰能力明显优于地表、井下水平方向观测;(2)与地表观测相比,井下地电观测能在一定程度上抑制地表直流电流、雷电、和金属管线类的影响;(3)地表直流电流对地电观测所产生的干扰影响远大于交流电流.
At the observatory of Hoi’an Power Station, the comparison between surface and underground geotechnical observations was carried out and the effects of surface runaway current, metal pipelines and artificial AC / DC current on surface and subsurface geo-electric observation were analyzed. 1) Under the condition of lead electrode, the long-term stability of downhole geoelectric observation is obviously better than that of surface observation; the anti-interference ability of vertical observation is better than that of surface and downhole; (2) Compared with surface observation, Downhole geoelectric observation can restrain the influence of surface direct current, lightning, and metal pipelines to a certain extent; (3) The influence of surface DC current on the geoelectric observation is much greater than that of the alternating current.