堤坝地形对直流视电阻率曲线影响的实验研究

直流电阻率法是一种无损检测方法，因其快速、经济、直观、高效率而常用于堤坝隐患探测中，其基本理论是建立在半无限空间基础上的，然而堤坝作为一类较为特殊的几何体，会影响地下电场的空间分布规律，因此堤坝的这种特殊几何形状会对视电阻率造成一定的影响，从而给测量结果的正确解释带来不利影响。通过对几类简单堤坝隐患模型实验的结果进行分析可知，在堤坝上进行直流电阻率法工作必须进行地形改正，才有可能对测量结果做出正确的解释，最后简要介绍了地形改正的方法。

EXPERIMENTAL STUDY OF THE INFLUENCE OF THE DYKE TOPOGRAPHY ON THE APPARENT RESISTIVITY

Direct current resistivity method is a kind of nondestructive technology. Because this method has the characteristic of rapidity, economy, visualization and high efficiency, it is widely used in the detection of the hidden trouble of the dam, and its basic principle is based on the half infinite space, so the particular geometry of the dam will affect the spacial distribution of the underground electric field, consequently the particular geometry of the dam will lead to the influence of the apparent resistivity, and will arouse adverse effects on the interpretation of the results. Through analyzing the results of several simple model tests of the hidden trouble, it proves that topographic correction is necessary when the direct current resistivity work is done on the dam, and this will work out the right interpretation for the measured results. At last the method of topographic correction is briefly introduced.