水位升降条件下驮英水库上游围堰渗流及稳定性分析

Analysis of upstream cofferdam seepage and stability under water level rising-to-falling conditions for Tuoying Reservoir

围堰作为维护河道中永久性水工建筑物施工的临时建筑物,其自身的稳定对于整个工程非常重要。本文针对驮英水库土石围堰施工渡汛工况,考虑防渗土工膜失效的不利条件,在围堰填筑料检测和试验成果基础上,依据非饱和土渗流理论和极限平衡理论,运用有限元分析软件GeoStudio进行了水位上升—下降过程的围堰二维稳定/非稳定渗流和围堰边坡抗滑稳定性分析。

As the temporary building to protect construction of permanent structures within the river course,the stability of cofferdam is important for the whole project.In view of the construction conditions of Tuoying Reservoir during flood period,taking into account the unfavorable conditions of impervious Geomembrane failure,based on earthrock cofferdam filling material inspection and testing results,2D stable/unstable seepage and slope anti-sliding stability of cofferdam under water level rising-to-falling condition were analyzed with finite element software GeoStudio according to the unsaturated soil seepage theory and limit equilibrium theory.