库水位快速升降对有集水廊道土石坝渗流的影响

Effect on seepage of earth-rock dam with the collection gallery under rapid fluctuation of reservoir water level

针对地下水控制工程的修建影响大坝渗流的研究,结合工程实际,并基于非饱和非稳定渗流原理,对修建有集水廊道的土石坝进行了渗流分析,研究结果表明:水位上升,渗漏量增大;水位下降,渗漏量减小,但坝基渗漏是主要的渗透通道。集水廊道的修建使大坝的渗漏量、坡降增大,但它能够有效地降低坝内和下游河床浸润线,减少下游浸没区范围,有利于大坝整体抗滑稳定和后期安全运行。

The study on the effect of seepage in the dam of groundwater control engineering is not enough presently.Incorporated with the engineering practice and based on unsaturated unsteady seepage theory,the seepage analysis on the earth-rock dam with water-collection gallery was carried out.The result show that seepage increases with the water level rises and otherwise,the seepage decrease with the water level drops,the leakage in the dam foundation is the main way in all leakage.The construction of water-collection gallery increases the leakage and water gradient.It will decrease the saturation line in the dam and downstream water bed,decrease the submerging area in the downstream effectively.It is beneficial to the dam anti-sliding stability and later safe operation.