高密度电法和声呐渗流法在病险水库渗漏探查中的应用

Application of High Density Electrical Method and Sonar Seepage Method in Leakage Detection of Dangerous Reservoirs

为了查明某水库坝区渗漏隐患区位置,该文介绍了采用高密度电法作为主要探查技术手段,结合钻孔资料,通过分析电阻率变化情况来圈定渗漏隐患区域,并对隐患区进行钻孔揭露及注压水试验,综合声呐渗流技术,进一步准确测定渗漏部位以及渗流速度参数。结果表明:高密度电法能有效查明坝区渗漏区域的规模及埋深,反映出渗漏隐患区域的分布;声呐渗流探测技术能准确测定渗漏点位置及渗流速度参数;综合探查成果有效揭示了该水库坝区渗漏主要原因为坝基下部基岩局部存在岩溶发育区,局部坝段的坝体填土也是坝区渗漏的次要因素。该工程说明高密度电法和声呐渗流法能有效查明病险水库坝区渗漏问题,为水库大坝防渗处理提供了科学依据。

In order to find out the location of the potential leakage area in the dam area of a reservoir,this paper introduces that the highdensity electrical method is used as the main exploration technical mean,combined with the drilling data,the potential leakage area is delineated by analyzing the change of resistivity,the drilling exposure and water injection test are carried out for the potential leakage area.The sonar seepage technology is integrated to further accurately determine the leakage location and seepage velocity parameters.The results show that the highdensity electrical method can effectively find out the scale and buried depth of the leakage area in the dam area,and reflect the distribution of the potential leakage area;The sonar seepage detection technology can accurately determine the location of seepage point and seepage velocity parameters;The comprehensive exploration results effectively reveal that the leakage in the dam area of the reservoir is mainly due to the local karst development area in the bedrock at the lower part of the dam foundation,and the dam filling in the local dam section is also the secondary factor of the leakage in the dam area.The project shows that the highdensity electrical method and sonar seepage method can effectively find out the leakage problem in the dam area of dangerous reservoir,and it provides a scientific basis for the anti-seepage treatment of reservoir dam.