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通过砂岩地层渗透过程中不同部位的地电场响应特点试验,获得了砂岩断面渗水过程中地电场参数瞬时响应规律。注水渗透过程中,模型各电极测试点位置的自然电位均呈现为升高的趋势,并且砂层非饱和厚度与自然电位值之间体现出很好线性相关关系。在水位上升至测点位置后,激励电流出现阶跃突变,之后呈现为一个相对平稳的数值。利用渗流过程中不同位置自然电位和激励电流的变化特征,可判定砂层中水的渗流方向、渗流速度和渗漏点位置。
The transient response of geoelectric field during sand seepage process was obtained through the geoelectric field response characteristics test of different parts during the process of sandstone formation seepage. During the process of water infiltration, the natural potentials at the test points of the model electrodes all showed an increasing trend, and there was a good linear correlation between the unsaturated thickness of the sand layer and the natural potential value. After the water level rises to the measuring point, the excitation current appears a sudden jump, then appears as a relatively stable value. By using the variation characteristics of natural potential and excitation current at different positions during the seepage process, the seepage direction, seepage velocity and seepage point of water can be judged.