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澜沧江上游某电站坝前大面积发育倾倒变形体,边坡中的地下水对其稳定性有重大影响。为此,运用二维饱和—非饱和渗流有限元分析程序SEEP/W,并联合极限平衡法分析库水位变动期间库水位变动速率对倾倒变形体边坡渗流场及其稳定性的影响机理及规律。结果表明,水位变动速率对倾倒变形体的瞬时渗流场有较大影响,坡体表面形态在水位变动期间,对其水力梯度影响较为明显;水位上升阶段,水位变动速率与倾倒变形体稳定性呈现正相关关系,水位上升速率由0.5 m/d增大至5 m/d,稳定性系数上升了0.7%~2.0%,而水位下降阶段,水位变动速率与其呈现负相关关系,堆积体稳定性系数降低0.6%~1.6%,且其存在临界速率(2.0m/d)、水位(死水位以上3/8坡高处),速率、水位超过其临界值之后,稳定性变幅明显放缓甚至出现回升。
The upper part of the Lancangjiang River has a large area of dumped deformation body in front of the dam, and the groundwater in the slope has a significant impact on its stability. Therefore, the SEEP / W finite element analysis program SEEP / W is applied to analyze the influence mechanism and rule of reservoir water level fluctuation on the seepage field and stability of dumping body slope during the change of reservoir water level . The results show that the rate of water level fluctuation has a great influence on the instantaneous seepage field of the dumping body. During the water level fluctuation, the surface shape of the slope body has obvious influence on the hydraulic gradient. In the rising stage of water level, the rate of water level change and the stability of the dumping body The increase rate of water level increased from 0.5 m / d to 5 m / d and the stability coefficient increased by 0.7% ~ 2.0%. However, during the stage of water level drop, the rate of water level change had a negative correlation with it, and the stability coefficient of deposit (0.6% ~ 1.6%), and its critical velocity (2.0m / d) and water level (3/8 slope above stagnant water level), the rate of change and the water level exceed its critical value, the stability amplitude obviously slowed down or even appeared Pick up.