岳城水库坝基渗漏多元示踪试验研究

Experimental Study on Multi-element Tracing for the Seepage of Dam Foundation in Yuecheng Reservoir

选定NaNO2、KI、NaCl作为示踪剂,对岳城水库坝基渗漏进行示踪试验,揭示坝基地下水的渗流特征与渗漏途径。示踪试验表明,各接收孔地下水中NO2-、I-、Cl-含量明显增高,示踪信息清晰可辨。综合分析认为水库右岸坝基主渗透段水流速度约3.89m/h。根据工程勘察和多源示踪结果计算,右岸坝基约有1.32m3/s的水以潜流形式经坝基流向下游。示踪试验为水库防渗加固治理提供依据。

Selecting NaNO2, KI and NaC1 as the tracers in the tracing tests for the seepage of the dam foundation of Yuecheng Reservoir, the seepage features and the percolation path of the groundwater in the dam foundation are revealed. The tracing tests showed that the contents of NO2, I and C1 of groundwater in the receiving apertures increased obviously, and the tracing information was distinct and easily distinguishing. From the comprehensive analysis it is thought that the flow velocity of the main infiltration section in the right bank of the reservoir dam foundation is about 3.89m/h. According to the result from the engineering reconnaissance and the multi-element tracing, there is about 1.32m^3/s of water through the foundation to the downstream in the formof undercurrent flows. The tracing tests provide the basis for the anti-seepage and reinforcement of the reservoir.