Abstract: Based on the arrangement of seepage monitoring instruments and the monitoring results during operation of Dachaoshan hydropower station, the seepage variation law of dam body and foundation during operation is analyzed, and the seepage distribution, intensity, source, flow direction and its variation are understood. Based on this, it can be judged that whether there is a serious concentrated leakage zone and whether there is an unfavorable trend change under the effect of reservoir water. At the same time, to avoid the shortcomings of using single observation item to analyze dam seepage state, the multiple factors affecting the dam seepage are organically linked, and the relationship between the influencing factors and the effect quantities are considered. By the above analyses, a deeper and more accurate understanding of the seepage distribution, path and development trend of the dam is obtained, which will be helpful for better seepage control management in the future, and can provide more basis for the analysis of engineering treatment effect, as well as provide reference for other projects.

Key words: Dachaoshan hydropower station, dam seepage, monitoring design, engineering measure, seepage analysis

摘要： 基于大朝山水电站大坝的渗流量监测设计布置及运行期监测情况，系统分析大坝投运以来的坝体和基础内部渗流量变化规律，掌握了渗流的分布区域、强度、来源、流向及其变化等情况，据此判断有无比较严重的集中渗漏带，研究在库水位作用下有无不利于安全的趋势性变化。同时将影响大坝渗流量的多元因素有机联系起来，考虑了影响因素与效应量之间的关系，避免了仅仅用单项观测量分析大坝渗流状态的不足。通过分析，对大坝渗流的分布、渗径、渗流发展趋势有了更深、更确切的了解，有利于今后更好地进行渗控管理，可为先前工程地质问题和施工裂缝的处理效果提供更多的依据和补充，也可供其他工程参考。

关键词: 大朝山水电站, 大坝渗流, 监测设计, 工程措施, 渗流分析