渗流场的差分法与防渗结构侧水压力的探讨

Discussion of Differential Methods for Seepage Location and Lateral Water Pressure of Impervious Structure

为解释常用的防渗体侧水压力计算模型与实测值之间的明显差异,文章提出:“节点间等效渗透系数”、“拓展零渗透节点”、“可变零渗透节点”等概念在分析地下水渗流场中的意义,以解决差分法对地下水渗流潜水面的数值模拟问题;并在模拟工程实例的基础上,对侧水压力实测的模拟结果和对常用防渗模型误差来源的分析;指出常用防渗模型侧水压力的分析误差主要是因该模型未能较准确反映实际流场而造成的;在工程应用中,防渗体侧水压力的确定应根据不同情况予以分别对待。

To explain the distinct difference between the results from calculation model and actual measure value of lateral water pressure of impervious structure, this article puts forward the concepts of ＂equivalent osmosis coefficient among joints＂, ＂develop zero osmosis joint＂ and ＂variable zero osmosis joint＂ in analysing groundwater seepage flow, for selving numerical simulation by differentail method for latent water surface of groundwater seepage flow. On the base of simulated engineering examples and analysis of the results of lateral water pressure simulation and the error of common impervious model, the main reason of analysis error is pointed out that the common impervious model can not reflect the practical flow more accurately and in the actual engineering, the lateral water pressure of the impervious structure should be determined according to specific different situations.