有自由面渗流分析中密集排水孔幕的数值模拟

为准确模拟有自由面渗流场中密集排水孔幕的渗流行为,提出排水孔连续剖分新模式,避免了排水子结构算法中排水孔与整体网格不连续带来的计算困难,并在顶排型排水孔孔端设置虚拟的"渗流开关器",来实现对其作用的甄别。当排水孔失效,"开关器"关闭时只需把孔内结点作为内部点,避免了对失效排水孔按边界再处理的麻烦。排水孔的连续剖分和"开关器"的设置,既可以精细的模拟每个排水孔的作用、解决自由面穿越排水孔问题,又使大规模密集排水孔的模拟大为简化。算例验证了该方法的准确性和实用性。

Numerical simulation for densely-distributed drainage holes in seepage field with free surface

A new model of drainage holes was proposed in order to accurately simulate behavior of the densely-distribute drainaged holes in seepage field with free surface,the difficulty of calculation due to the ill assortment of hole nodes with global net was avoided,and the hypothetical switch of seepage was intercalated in the overflowing holes in order to judge their function.The drainage hole nodes were treated as global net to avoid trouble and were considered as boundary nodes when the drainage holes were invalidated.By use of this method,the effect of each drainage hole could be well simulated and the problem of holes in seepage field with free surface was solved,meanwhile,and the numerical simulation of mass holes was very easy.The correctness and practicability of this method was proved by examples.