土石坝绕坝渗流分析方法及防渗措施研究

Study on the Analysis Method and the Anti-seepage Measures for the Seepage Around the Earth-rockfill Dam

如何科学合理地进行具有强透水层坝肩土石坝的绕坝渗流分析,对于此类土石坝的防渗设计具有十分重要的意义。本文结合一工程实例,进行了水力学法与三维有限元法的比较研究。结果表明:由于有限元法避免了某些人为的假定,且计算模型更为接近实际,因此其计算结果更为合理。同时,关于该工程绕坝渗流防渗措施的研究结果表明,坝肩混凝土防渗墙的延伸长度与绕坝渗流特性的改善呈正相关性,但其长度超过一定值时,改善的效果将趋于明显减小。

How to scientifically and reasonably analyze the seepage around the earth rockfill dam which possessed of the strong aquitard around the abutment, the anti-seepage design for this type of earth rookfill dam has a very important significance. Combined with a project, this paper carried out a comparative study of hydraulic and three-dimensional finite element method. The results shown that due to the finite element method avoided the certain man-made assumption, the calculation model much close to the actual, so the results should be more reasonable. At the same time, the research results about the anti-seepage measures showed that there is a positive correlation of lextension length of concrete cut--off wall in abutment with improvement of seepage characteristics around the dam, but its length is more than a certain value, the effect will tend to significantly reduced.