| 某水电站大坝6坝段化灌加强帷幕防渗耐久性分析 |
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| 引用本文： | 宋汉周,王凤波,周剑.某水电站大坝6坝段化灌加强帷幕防渗耐久性分析[J].水文地质工程地质,2005,32(5):69-72. |
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| 作者姓名： | 宋汉周 王凤波 周剑 |
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| 作者单位： | 河海大学地质及岩土工程系,南京,210098 |
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| 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。
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| 关 键 词： | 化学灌浆 防渗耐久性 析出物 |
| 文章编号： | 1000-3665(2005)05-0069-04 |
| 收稿时间： | 2005-03-09 |
| 修稿时间： | 2005-05-25 |
Analysis of anti-seepage durability of curtain-grouting strengthened with chemical materials in dam section 6 of a hydroelectric station |
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| SONG Han-zhou,WANG Feng-bo,ZHOU Jian.Analysis of anti-seepage durability of curtain-grouting strengthened with chemical materials in dam section 6 of a hydroelectric station[J].Hydrogeology and Engineering Geology,2005,32(5):69-72. |
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| Authors: | SONG Han-zhou WANG Feng-bo ZHOU Jian |
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| Abstract: | 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 HCO~-_3, 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. |
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| Keywords: | curtain-grouting strengthened with LW chemical materials durability of anti-seepage performance elutes |
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