蛟坞水库大坝渗漏探测及定向处理技术及应用

掌握水库渗漏的病因及隐患的空间展布是大坝防渗处置的前提和基础,针对渗透薄弱部位引进最优化、微创化的施工设计能起到事半功倍的加固效果。在介绍并行电法探测与定向处理技术原理的基础上,基于大坝渗流薄弱区与周围介质之间导电性的差异,利用并行电法对隐患区高效、准确定位,通过分析渗漏原因再对大坝不同区段实施定向分带灌浆,并对完工后的大坝实施了钻孔取样和电阻率动态检测。将水库渗漏探测及定向处理技术应用于蛟坞水库大坝的查漏与定向堵漏之中。应用结果表明,并行电法确定了蛟坞水库的核心渗漏区位于K0+007～K0+022m段的坝体部位,定向灌浆处理后大坝渗漏流量由1.45L/s显著下降至0.05L/s直至干涸,从而验证了所提方法的可行性。研究成果为病险水库的渗透破坏治理提供了新思路,具有较高的推广应用价值。

Application of Seepage Detection for Jiaowu Reservoir Dam and Directional Treatment Technology

It is the premise and foundation of dam seepage prevention treatment to master the cause of reservoir leakage and the spatial distribution of hidden danger. For the parts with weak penetration, the optimized construction design can achieve twice the result with half the effort. By introducing the principle of parallel electrical detection and directional processing technique, based on the part with weak penetration and the surrounding medium in term of the conductivity, the parallel electrical method was used to efficiently and accurately determine the position of the potential area. By analyzing the causes of seepage, directional grouting was carried out on different sections of the dam. After the completion, the dam was conductive with borehole sampling and resistivity dynamic monitoring. It was proposed to apply the leakage detection and directional processing technology in the leakage detection and directional leaking stoppage of Jiaowu Reservoir. The application results show that the parallel electrical method determines the core leakage area of Jiaowu Reservoir locating at the dam body of K0+007~K0+022 m section. After directional grouting, dam seepage flow decreased from 1.45 L/s to 0.05 L/s, thus it verified the effectiveness of the proposed method. The results provide a new idea for the treatment of seepage failure of the reservoir with a high generalized and applied value.