南水北调中线工程总干渠渗流与蒸发损失研究

Research on seepage and evaporation of main channel of MiddleLine of Water Transfer Project from South to North

为了正确评价南水北调中线总干渠1000余km渠道的渗漏损失,找出产生渠道渗漏的主要影响因素以及控制这些影响的方法,进行了总干渠渗流输水损失分析研究。在开展国内外调研和全面分析南水北调已有地质资料的情况下,对南水北调中线总干渠进行分类,确定计算模型,选取适当参数,进行适当假定,采用有限元方法对总干渠输水损失进行了计算和合理性分析。计算结果表明:在采用全线衬砌情况下,衬砌完好时的渗漏量很小,渠系水利用系数很高;衬砌有一定破损时,渠道渗漏量与渠基渗透性关系密切;同时,还得出了3种破损率条件下的总干渠渗流、蒸发损失。

General stem channel of the Middle Line of Water Transfer Project from South to North with a length of over a thousand kilometer will cause seepage loss. For finding the main affecting factors and measures to control these effects, a research on seepage loss of main channel was performed. Under the conditions of investigating experience at home and abroad and analysing available geologic information in?situ, a calculation and rational analysis was conducted by means of classification of stem channel, determination of calculation model, selection of appropriate parameters, making suitable assumptions and using FEM. The calculation results showed that: in case of entire lining of main channel, the seepage quantity with perfect lining is very little and the utilization coefficient of the channel is rather high; when the lining of the channel has certain damage, the seepage quantity of the channel is related closely with the permeability of its foundation, meanwhile, the seepage quantities and evaporation losses are given under three failure rates.