渗流分析中复杂排水系统模拟的叠单元法

以叠单元理论为基础,对其前处理及数值积分进行了改进和完善,并将其应用于光照重力坝的渗控优化.对于选取的典型坝段,首先将其划分为考虑廊道和防渗帷幕、不考虑排水孔的整体网格;然后针对各层排水孔,建立其局部网格.由于整体网格和局部网格相互独立,在模拟不同排水孔参数时,整体网格保持不变,只需改变局部网格即可,从而显著减小网格划分难度.工程应用结果表明,叠单元法非常适用于渗流分析中复杂排水系统的精细模拟.

Superposed element method for simulating seepage problems with complex drainage systems

In seepage control and optimization,those parameters of the drainage holes,such as the location and the spacing and the trend,which need to be adjusted,causing the analysis of seepage problems with complex drainage systems a hard work.Based on the theory of the superposed element method,the pretreatment and the numerical integration have been improved,perfected and applied to the seepage control and optimization of the Guangzhao gravity dam.For the selected typical section block of the dam,it is divided into the global mesh firstly,considering the galleries and the seepage proof curtains and regardless of the drainage holes.Then the local mesh is created,considering layers of the drainage holes.Owing to the independence of the global mesh and the local mesh,it only requires changes in the local mesh with the global mesh stay the same in the simulation of different parameters of the drainage holes.And the difficulty of the meshing is decreased dramatically.The results of engineering application show that the superposed element method is very suitable for the detailed numerical simulation of seepage problems with complex drainage systems.