摘要
在分析坝址地质条件的基础上,依据近年来区内地下水宏观、微观动态以及析出物等特征,对6坝段化灌加强帷幕的防渗耐久性作了多手段综合分析和评价。分析表明:幕后Up6孔扬压力实测值近年来有回升之势,且与库水位之间的相关性趋于密切;幕后灌64孔排水量较大,且与库水位之间亦有较密切的相关性;幕后局部地下水的pH值低于坝前库水,且含有较高的HCO-3,为水溶液中含有源于化灌材料的有机质的氧化所致;幕后局部地下水溶液为非饱和态,即SI<0,表明相应部位具有较好的径流条件。据此认为,该坝段加强帷幕的局部防渗性能已发生了衰减。
In this paper, the durability of the curtain-grouting strengthened with LW chemical materials in a case is analyzed from the macro-micro trends of groundwater and elutes in dam section 6. The following four aspects can identified. （1） The uplift pressure value at Up6 behind the curtain-grouting had the tendency of increasing with time, and the close relation with the reservoir water level; （2） The flow-rate from drainage hole 6-4 was relatively large, with close relation ship with the upstream water level; （3） The local groundwater quality behind the curtain-grouting was abnormal, with a low pH value and a high content of HCO3^-, which resulted from the oxidation of organic substances contained in LW chemical materials, furthermore we found some organic substance occurring in the elutes; （4） The local groundwater solution behind the curtain-grouting was unsaturated, i.e. SI 〈 0, from which the local active flow behavior could be regarded good in a sense. As a conclusion, it could be drawn from the above that its anti-seepage performance was to weakened locally.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2005年第5期69-72,共4页
Hydrogeology & Engineering Geology
关键词
化学灌浆
防渗耐久性
析出物
curtain-grouting strengthened with LW chemical materials
durability of anti-seepage performance
elutes
