基于离散元法的柔性挡土坝稳定分析

A Stability Analysis of Flexible Retaining Dams Based on the Distinct Element Method

针对柔性挡土坝的结构特性,采用离散元程序UDEC对向家坝水电站2期纵向围堰挡土坝进行了数值模拟,得到了坝体在挡土前后的应力位移规律,通过对关键点部位的应力及位移变化情况的记录,更清楚地了解坝体的变形情况和受力特点。计算结果表明使用离散元分析这种柔性挡土结构是可行的,可以比较准确地抓住这种挡土形式的柔性特点,并能较好地模拟挡土坝发生的较大的法向变形和切向滑移,能够对构筑物的稳定性做出合理判断,对于施工应采取的措施提出了有益的参考。

The distinct element method of UDEC is used to simulate the cofferdam of Xiangjiaba Dam based the structural characteristic of flexible retaining dams,and the stress and displacement of the dams is then gained before and after the earth pressure acts on dam.Variations of stress and displacement of key points has been recorded and a clearer understanding of the dams＇ variation of displacement and stress characteristics is gained through the records.Numerical results indicate that the distinct element method of UDEC is reliable and feasible.It can catch the flexible characteristic of the gabion structure well and simulate the large variation of normal displacement and tangential sliding exactly,and it can estimate the stability of the structure.It sertves as a helpful reference for construction.