磨盘山水库坝基渗透稳定研究

磨盘山水库兴建遇到的主要地质问题是坝基渗漏及渗透稳定问题，将影响水库工程效益的发挥和大坝的安全运行，需采取适当的渗控工程措施。通过对坝基土颗粒组成及结构的分析，判别可能发生渗透破坏的类型，确定抗渗比降和允许比降。应用Visual MODFLOW进行水库坝区渗流场的三维渗流数值模拟分析，通过对18种渗控计算方案渗流场、渗流要素及防渗效果的统计分析，依据坝基土的允许比降，在安全、经济、合理原则的基础上，确定哈尔滨市磨盘山水库坝基渗控设计首选方案为：左岸防渗长度200 m、帷幕灌浆标准5 Lu。

Study on Seepage Stability of Dam Base for Mopanshan Reservior

The geological problems of the building of Mopanshan reservoir is the seepage of the dam base and its stability of infiltration,which will influence the exertion of the engineering benefit and the safely run of the dam and it needs proper measure to control the infiltration.Through the analysis on the granule constitute of the formation of the dam base,the type of the infiltration damage apt to happen has been defined and the anti-infiltration and the permissible depression ratio has also been determined.With the Visual MODFLOW,the three-dimension numerical modeling has been carried out to analyze the see-page field of the reservoir.After the statistics analysis of the seepage factors of the field under 18 different measures and its effect,the seepage-control measure of the Mopanshan reservoir in the city of Harbin is determined that the length of left bank to control the seepage should be 200 m,purdah grouting standard 5 Lu should be the principal measure,according to the permissible depression ratio of the dam base,on the base of safety,economy,principles with reason.