土工膜在淤地坝蓄水改造中的应用研究
Application Study of Geomembrane in Silt Storage Dam and Water Storage Reconstruction of Silt Storage Dam

土工膜是一种不透水材料，已广泛应用于各种防渗工程中。本文以平陆县贺家庄骨干坝为例，在分析土石坝和淤地坝设计原则的基础上，对淤地坝应用土工膜防渗及蓄水改造进行研究，提出3个改造方案。应用ABAQUS软件，研究流固耦合的边坡稳定性计算方法，在校核洪水位工况下对原坝体进行了验证，并对改造方案进行了计算和比选。结果表明：(1) 在改造方案中，水平铺盖长度的增加对浸润线的降低和安全系数的增大影响较小；(2) 选定的改造方案为复合土工膜斜墙加10 m长的水平铺盖，经计算其安全系数为1.438，比不加土工膜时，安全系数增加0.28，浸润线整体明显下降。
Geomembrane is a kind of impermeable material, which has been widely used in various seepage prevention projects. Taking Hejiazhuang key dam in Pinglu county as an example, based on the analysis of the design principles of earth-rock dam and silt storage dam, this paper studies the silt storage dam’s reconstruction by using geomembrane to prevent seepage and store water, and puts forward three reconstruction schemes. Using ABAQUS software, the slope stability calculation method of fluid-solid coupling is studied, the original dam body is verified under the condition of checking flood level, and the reconstruction scheme is calculated and compared. The results show that: (1) in the reconstruction scheme, the increase of horizontal blanket length has little impact on the decrease of saturation line and the increase of safety factor. (2) the selected reconstruction scheme is composite geomembrane inclined wall with 10 m long horizontal blanket. The safety factor is calculated to be 1.438, which is 0.28 higher than that without geomembrane, and the overall saturation line decreases significantly.