关键词: 防渗墙底界, 高密度电法, 视电阻率, 防渗墙无损检测,

Abstract: Cut-off wall is widely used in anti-seepage treatment of embankment. In order to ensure its impermeability, it is necessary to detect the bottom boundary of the wall. In this paper, a dynamic high density apparent resistivity test method was proposed to improve the detecting ability of bottom boundary. Firstly a physical model of cut-off wall was constructed, and then the high density electric test system and borehole were arranged on two sides of the wall. The dynamic electrical parameters before and after borehole injection of brine were tested. It was found that the apparent resistivity and its change rate were sensitive to the geological bodies affected by water injection. When the change rate of apparent resistance of geological bodies after water injection was about 15%, it could be used as the basis for determining the bottom boundary of the wall. Engineering practice further showed the effectiveness and reliability of the research method.

Key words: bottom boundary of cut-off wall, high-density electrical method, apparent resistivity, change rate of apparent resistivity,