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针对传统的渗流分析主要考虑饱和区的渗流而不考虑非饱和区的渗流存在一定的安全隐患问题,基于饱和—非饱和渗流理论,结合复合土工膜防渗坝设计了四种不同的水位组合,分别计算了饱和渗流量及饱和—非饱和渗流量,并分析了正常蓄水位下考虑与不考虑非饱和区的渗流速度场等变化规律。结果表明,考虑非饱和区后单宽渗流量有了明显下降,出溢点的渗流溢出坡降变小,且渗流路径变的较为陡直,靠近上游部分区域的渗透坡降相对较大,水压力在土工膜中的降低相对减小。
In view of the traditional seepage analysis, the seepage in the saturated zone is mainly considered without considering the seepage problem in the unsaturated zone. Based on the theory of saturated-unsaturated seepage and combining with the geomembrane seepage dam, four different water level combinations are designed. The saturated seepage volume and saturated - unsaturated seepage flow rate were calculated separately. The variation regularities of seepage velocity field with or without considering unsaturated zone under normal water level were analyzed. The results show that the percolation flow rate decreases obviously after considering the unsaturated zone, the slope of seepage overflow at outflow point becomes smaller and the seepage path becomes steeper, and the gradient of seepage near the upstream part is relatively larger. The pressure drop in the geomembrane is relatively reduced.