库中堆石坝坝坡稳定性分析

以重庆市万州区天仙湖堆石坝为研究对象,采用极限平衡法分别研究了“不同水位工况”“是否加设盖重”以及“库区水位变化”等因素对上下游坝坡稳定性的影响.分析结果表明：加设盖重能够行之有效地提高坝坡稳定性;且加设盖重后最危险的水力条件出现在上游库区水位下降的过程之中,其水位高程约为158.00 m,对应的安全系数Fs为1.320.对于水位升降的不同变化情况,坝坡的稳定安全系数走势各有特点：水位骤降时,坝坡的稳定安全系数先减小后增大,而水位骤升时却相对平缓.

Analysis of Slope Stability of Rock-Fill Dam in Three Gorges Reservoir

Based on the limit equilibrium method, the slop stability of the Tianxian lake sediment storage dam has been analyzed. As the both sides of the dam are in the water, various factors have been considered such as ＂different water- level conditions＂, ＂construction of seepage berms＂, and ＂the water-level variations＂ and so on. The result shows, the construction of seepage berms could effectively improve the stability of dam slopes. After constructing seepage berms, the most dangerous hydraulic condition comes up at the level about 158.00m during the process of the rapid drawdown of the upstream, and whose safety factor is 1. 320. The different conditions of water-level variation showed different tendency of safety factors. The tendency of safely factors decreased as the reservoir water rapidly drawdown and then increased gradually. However, when the reservoir water rapid rise, the tendency are relatively smooth.