大坝基础灌浆水灰比的探讨  

Discussion of Water-cement Ratio for Dam Foundation Grouting

作　　者：谭日升[1] 

机构地区：[1]长江水利委员会长江科学院,湖北武汉430010

出　　处：《水力发电》2011年第8期45-48,共4页Water Power

摘　　要：关于大坝基岩灌浆开灌水灰比,有的专家强调浓浆开灌,有的专家不赞成浓浆开灌。通过分析国内外的经验,认为开灌水灰比应根据基岩的透水率和灌浆试验结果来选择。灌浆前压水透水率特别大的灌浆段,可以用较低水灰比的浓浆开灌,节约灌浆时间和灌浆材料;除此以外,应该用稀浆开灌,确保浆液在相对细的裂隙中达到要求的扩散半径,并在灌浆过程中,根据情况逐步加浓浆液。There are different opinions on the initial water-cement ratio for dam foundation grouting, in which some experts stress that the grouting should be started with thick grout, and others do not agree. By analyzing domestic and international practices, the thinking that the initial water-cement ratio should be selected based on bedrock permeability rates and grouting tests is proposed. For the sections with particular large permeability rate, the thick grout should be used for initial grouting and that can shorten grouting time and save grouting materials; and for other sections, the thin grout should be used for ensuring the grout reaching required range in fine fissures, and then the grout should be progressively thickened according to the grouting process.

关 键 词：坝基防渗 帷幕灌浆 水灰比 

分 类 号：TV543[水利工程—水利水电工程]