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下面准备对地下水非稳定渗流的数学模型以及模型试验研究等方面的问题谈些意见,供原作者参考。一、地下水非稳定渗流的数学物理方程1.具有自由表面的非稳定渗流在研究浅层地下水渗流问题时,系基于假定土体骨架和流体为不可压缩的前提下导得的,其渗流方程表达式如原文式(5)。该式的形式虽与稳定渗流方程一致,但在求解过程中其自由面边界是随时间t而改变,故它归结为一个与时间有关的动边界问题,显然在自由面处应满足下面的边界条件
Prepare some opinions on the mathematical model of unsteady groundwater seepage and model test research, etc., for reference by the original author. I. Mathematical physical equation of unsteady groundwater seepage 1. Unsteady seepage with free surface When studying shallow groundwater seepage problems, it is based on the assumption that the soil skeleton and fluid are incompressible, and the percolation equation is expressed. Such as the original style (5). Although this formula is consistent with the stable seepage equation, its free surface boundary changes with time t in the solution process, so it comes down to a time-related dynamic boundary problem. Obviously, the following boundary should be met at the free surface. condition