南门峡水库渗漏路径地质雷达探测分析

Detection and analysis of seepage path of Nanmenxia reservoir using ground penetrating radar

南门峡水库存在严重的渗漏问题,历次的灌浆都不能很好地解决这一问题。为查明其渗漏问题,引进的英国Groundvue系列地质雷达系统,探测水库的渗流通道,寻找主要渗漏路径。通过系统的探测分析,得出坝基基岩存在明显的强渗漏带,历次的注浆帷幕与坝基的防渗墙有2~3 m的水平距离,右岸注浆平硐局部有明显的破碎发育带等结果,这为南门峡水库的除险加固设计与施工提供技术支撑。

Seepage of Nanmenxia Reservoir was serious,and a series of grouting could not solve the problem. In order to find out leakages that lead to the seepage,a Ground Penetrating Radar System of the British Groundvue series was introduced to detect the seepage passage of the reservoir to find the main leakage path. By detecting the reservoir and analyzing the results,a conclusion is drawn that there is obvious strong leakage in the bedrock; that there is 3 m distance in horizontal direction from the previous curtain grouting belt to the cut-off wall in the dam foundation; that there is an obvious broken belt that developed locally on the right bank of the grouting tunnel. These findings provide a technical support for design and construction of danger-prevention and reinforcement for Nanmenxia reservoir.