复合黏土心墙材料在土石坝中的应用分析

Application Analysis of Composite Clay Core Wall Material in Earth-rock Dam

本文结合东阿水库大坝,对具有垂直心墙和两种不同材料纯黏土和混合黏土的土坝进行了一系列数值分析,并结合大坝施工期间心墙内的固结条件完全不排水和部分排水条件两种类型进行了分析。分析结果表明:对于完全不排水,当岩芯由纯黏土组成时,施工期间岩芯内产生的超孔隙水压力相对较高。对于部分排水,两种类型岩心中的超孔隙水压力值取决于施工和固结速率,如果岩芯排水受阻,则由纯黏土组成的岩芯中的沉降相对较高。当允许固结岩芯时,由纯黏土和混合黏土组成的岩芯沉降差异不大。由纯黏土材料组成的岩心的水平位移值高于由混合黏土组成的岩心的相应值,应进行进一步推广及应用。

In this paper,a series of numerical analyses of earth dams with vertical core wall and two different materials,pure and mixed clay,are carried out in combination with the two types of consolidation conditions in the core wall during dam construction:completely un-drained and partially drained.The results show that when the core is composed of pure clay,the excess pore water pressure generated in the core during construction is relatively high for completely un-drained.For partial drainage,the value of excess pore water pressure in both types of cores depends on the construction and consolidation rates,and if core drainage is obstructed,the settlement in cores composed of pure clay is relatively high.When core consolidation is allowed,there is little difference in settlement between cores composed of pure and mixed clays.The horizontal displacement value of the core composed of pure clay material is higher than the corresponding value of the core composed of mixed clay,so it should be further popularized and applied.