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该文针对以钻孔液为电耦合剂的普通视电阻率测孔装置存在的钻孔液对测量结果产生较大偏差的问题,将孔中探头部分的线圈电极改成可以直接接触孔壁、甚至刺入软质孔壁的探针电极。实测数据分析结果表明,该改进措施一定程度上消除或减少了钻孔液对孔内视电阻率测量结果的影响;不同性质的岩土体测量结果有不同的影响,纠偏率大小与孔壁岩土体性质及钻孔液性质有关;钻孔液对孔壁的电阻率影响越大,纠偏率越大,反之亦然。
In this paper, aiming at the problem that the drilling fluid existing in the conventional apparent resistivity measuring device with the drilling fluid as the electrical coupling agent has a large deviation from the measurement result, the coil electrode of the probe part in the bore is changed to directly contact the hole wall, Even piercing the soft hole wall of the probe electrode. The measured data analysis results show that the improvement measures to some extent eliminate or reduce the impact of drilling fluid on the apparent resistivity measurement results; different properties of rock and soil measurements have different effects, correction rate and hole wall rock Body properties and the nature of the drilling fluid; drilling fluid on the resistivity of the hole the greater the correction rate is greater, and vice versa.