梅山水电站右坝肩渗流特征分析

依据水文地球化学原理，库水作为一种溶液，在向坝基渗透过程中，既传递水的物理特性如压力、水量等，又与坝基岩石、帷幕、混凝土间产生物理化学作用，形成新的水质特征。为此，对梅山水电站右坝肩坝基排水孔水位、水量、水质进行定期观测，并对现场水pH值测试资料进行了系统分析。分析结果表明：工程措施效果明显；拱廊道内大流量排水孔水主要来自库水；拱廊道少数排水孔水中K^ Na^ 含量较丰富，此是坝基水化学潜蚀的结果。

Analysis of characteristics of seepage from right dam abutment at Meishan Hydropower Station

According to the principles of hydrology and geo chemistry, water in reservoirs may infiltrate into dam foundations. During this process, physiochemical reactions may occur between the water, dam foundation rocks, grout curtains, and concrete, forming new characteristics of water quality. In consideration of the above fact, an observation is performed of water table and water quality from drain holes in the right dam abutment of the Meishan Hydropower Station. The pH values of the water measured are systemically analyzed. Some conclusions are drawn: the engineering measures adopted are reasonable, the large flow from drain holes in arcades is mainly from the reservoir, and the abundance of K ++ Na + in some drain holes is caused by dam foundation water induced chemical corrosion.