坝基帷幕体防渗效果及其时效多指标评价体系研究  

Studying on the Multi-Index Evaluation System in Anti-Seepage Performance and Time Effectiveness of Dam Foundation Curtain-Grouting

作　　者：杨永祥[1] 徐建光[2] 郭张军[2] 

机构地区：[1]西北工业大学基建处,陕西西安710072 [2]陕西电力科学研究院,陕西西安710054

出　　处：《西安理工大学学报》2008年第4期455-461,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(50139030)

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,对某水电站大坝6坝段化学灌浆加强帷幕的防渗耐久性作了多手段综合分析和评价。通过扬压力和渗流量与库水位之间的相关性研究表明,两者与库水位相关性较为密切,且呈现阶段性变化;化学灌浆材料中有机质的氧化造成该坝段幕后地下水的pH值低于坝前库水,且含有较高的HCO3-;饱和指数SI<1,表明相应部位具有较好的径流条件。由此认为该坝段帷幕体的局部防渗性能已发生了衰减。实例结果表明,该评价体系可行且有效。Based on the analysis of surveying into geologieal condition of dam site, the durability of the curtain-grouting strengthened with chemical materials in some hydro-power station dam is analyzed from macroscopic and microscopic dynamic of groundwater as well as sludge in dam section 6. By researching into correlation of uplift and seepage discharge with reservoir water, the two characteristics turn out to be in close relation with reservoir water, appearing in shape of periodical variation. The oxidating process of organic part of chemical grouting material has caused a lower pH value of the groundwater in the section than reservoir water, with higher HCO3^-. The value of Saturation Index is less than 1 ,in abbrev, as Sl 〈 1, whereby indicating a good runoff condition in the corresponding part. It can be considered from the above conditions that the anti-seepage performance of curtain-grouting body of that dam section has been weakened locally. The experiment results indicate that the multiple index evaluation system is feasible and valid.

关 键 词：帷幕体 防渗效果 时效性 多指标评价体系 

分 类 号：TV698.23[水利工程—水利水电工程] F273.1[经济管理—企业管理]