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为了解复合土工膜防渗高土石坝围堰的结构特性,基于对高土石围堰的填筑过程和土工膜力学、渗流特性的模拟,结合某土工膜防渗高土石围堰工程,分析了围堰施工—运行过程中土工膜与混凝土防渗墙的运行状态。结果表明,在高土石围堰施工—运行过程中,土工膜水平铺设段与底部台阶铺设段相接处为易损区域;土工膜破坏后,膜后堰体浸润线明显抬高,渗漏量成倍增加,对堰体稳定造成不利影响,可在有较大概率破损的部位采取增设局部加强抗渗垫层及加厚过渡料区等措施保障安全。
In order to understand the structural characteristics of composite geomembrane seepage control embankment with high earth-rockfill dam, based on the filling process of high earth-rock cofferdam and geomembrane mechanical and seepage characteristics simulation, combined with a geomembrane impermeable high earth cofferdam project, Cofferdam construction - the operation of geomembrane and concrete cutoff wall operating status. The results show that in the process of construction-operation of the high earth-rock cofferdam, the junction between the geomembrane horizontal laying section and the bottom stepped laying section is the vulnerable area. After the geomembrane is destroyed, the immersion line of the post-weir is obviously increased, Doubled, adversely affecting the stability of the weir. In places with a high probability of damage, additional measures such as strengthening the seepage-absorbing cushion locally and thickening the transition zone can be adopted to ensure safety.