【作者】 王效琴；

【导师】 郑秀清；

【作者基本信息】 太原理工大学 ， 环境工程， 2004， 硕士

【摘要】 随着城市生态建设步伐的加快，一些城市纷纷对穿过城区的河道进行绿化整治。太原市政府为树立绿色生态城市的形象，曾进行了汾河公园一期美化工程建设，在河道内构筑了四座橡胶坝，形成三个蓄水池，蓄水池水位高出原汾河水位1～3m，在汾河两岸形成了绿草如茵、池水碧波荡漾的景观。现拟进行汾河公园二期美化工程，在一期工程的基础上，分别向北延伸2.4公里，向南延伸5.7公里。由于太原市区的地下水运动特点是地下水补给河水，河道蓄水以后，地下水渗流特征将被改变，可能使城区地下水位上升，从而造成土地盐碱化、沼泽化和建筑地基的浸没，产生严重的不良后果。 为了预测汾河蓄水后地下水渗流场的变化，对比分析蓄水池无防渗处理、有防渗处理、悬挂式防渗处理及蓄水池底部隔水底板稳定性等工况条件对蓄水池渗漏量、城区地下水位壅高值的影响，本文对不同条件下工程区的地下水渗流特征进行了 太原理工大学硕士研究生学位论文数值模拟。 由于蓄水池蓄水后，在蓄水池与地下水之间形成了很大的水头差，使得地下水的垂向流动不可忽略，所以本研究选择三维流数学模型模拟地下水运动。在模拟计算中，本文采用水平流阻滞物(1.IFB)模拟防渗墙，更客观地反映了防渗墙的阻水特性。迭代计算采用预调共扼梯度法(PCGZ)，不仅考虑了水头的收敛，而且还考虑单元流量的收敛，使计算结果更可信。 模型的识别与验证结果表明，所建立的数学模型是合理的，工程区水文地质条件的概化、获得的参数组合符合实际情况。应用此模型，分别对不同工况条件下，工程运行一年后的渗流场特征、蓄水池渗漏量、水位奎高值进行了模拟计算。结果表明:不做防渗墙时，蓄水池渗漏最为严重，且会造成城区较大范围的浸没危害;悬挂式防渗处理防渗效果很差;封闭式防渗处理能大幅度降低渗漏量、减小浸没影响范围，为被推荐的最佳工程处理方案。更多还原

【Abstract】 With the ecological construction developing, many cities have afforested riverway through the city proper. For setting green city image, The government of Taiyuan city has beautified the Fenghe park as the first stage project which had build four rubber dam in riverway forming three reservoir where water lever was 1-3m higher than that of before. Now, the second stage project is ready to stretch 2.4 km to the north and 5.7km to the south similar to the first stage project.Usually, groundwater movement in the city proper recharges Fenhe River. Characteristics of groundwater seepage field will be changed after riverway is stored water, ground water lever in the city could rise, which will result in a series of environmentalproblems, such as soil salt basification, swamping and immerging of city’s building base.To forecast the changes of groundwater seepage after construction of the second project, the author contrasted and analyzed the effects of no imperious wall disposal, imperious wall disposal, hanging-style imperious wall disposal and stability of the reservoir’s bottom layer on the reservoir’s seepage quantity and groundwater level of the city proper. The numerical model is established and used to simulate the groundwater seepage field in project area under different conditions.After stored water in Fenhe River, great hydraulic gradient would be formed between reservoir and groundwater. It is not reasonable to ignore the vertical moving of groundwater. Therefore, three dimensional flow model is applied in the study to simulate groundwater movement. During calculating, the author adopted horizontal-flow barrier (HFB) to simulate the imperious wall, which made it more objective to reflect seepage characteristics. PCG2 iterative method, which takes into account convergence of both cell flux and water head, is used in the paper.After calibrating and verifying the model, we can draw the conclusion that the mathematic model was correct, and the generalization of the hydrogeological conditions and the parameters are reasonable.The author Apply this model to calculate the reservoir seepage field, seepage quantity and the increase of water lever under deferent conditions one year later the project running. The results indicated that it is most severe of reservoir seepage when there is no imperious wall, Also bringing large-scale immerging problems in the city; The function of hanging-style imperious wall is very poor; The closure-style imperious wall could notably reduce seepage quantity and substrata immerging incidence and it was recommended to be the most perfect design.更多还原