有密集排水孔幕的饱和-非饱和渗流场全精细数值模拟分析

All-Refined Saturated-and-Unsaturated Simulation Analysis of Densely-Distributed Drainage Holes

对于有密集排水孔幕的工程渗流问题 ,只进行稳定饱和渗流分析往往是不够的 ,饱和 -非饱和排水子结构分析方法正是解决了这一问题 ,同时为了全面精细地模拟排水子结构的实际渗流状态 ,首次提出了全精细数值模拟的理论和方法。在针对 2类不同排水孔提出不同的完整水力学模型的基础上 ,详细讨论了不透水边界、已知结点水头边界、饱和逸出面边界、降雨入渗边界、非饱和蒸发入渗边界等有关子结构排水孔及其他表面可能存在的边界条件的分类处理方法 ,特别针对顶排型排水子结构排水孔内部水位提出了严密的数学处理方法。工程算例表明 ,针对密集排水孔幕的全精细数值模拟方法是正确的 。

For the seepage problems of densely distributed drainage holes, only steady saturated seepage analysis is not enough frequently. In this paper, the analytical method of saturated-and-unsaturated drainage sub-structure is adopted to solve the problem. Meanwhile, in order to bring comprehensive and refined simulation to the actual seepage status of drainage sub-structure, the theory and method of all-refined numerical simulation is presented for the first time. The classifying and processing methods for the boundary conditions of non-permeability, water head of nodes known, saturated escape surface, rainfall infiltration, unsaturated evaporation and infiltration, and other surfaces existing possibly in the substructure, are discussed in detail based on the different complete hydraulics model of the two different types of drainage holes proposed. Especially, the precise mathematical processing method for the internal water level of drainage hole of overflowing type of drainage sub-structure is presented. The case study shows that the all-refined numerical simulation method for densely distributed drainage holes is correct and applicable in solving the engineering seepage problems related.