下坂地坝基深厚覆盖层帷幕灌浆现场试验工艺研究

IN-SITU EXPERIMENTS FOR DEEP CURTAIN GROUTING IN 150 M THICK OVERBURDEN DEPOSIT FOR SEEPAGE CONTROL IN HYDROPOWER DAM FOUNDATION AT XIABANDI,XINJIANG PROVINCE

新疆下坂地水利枢纽工程的坝基为深厚覆盖层,厚度达147.95m,其结构较为复杂,主要由冰碛层、冲洪积砾石层和砂土层透镜体组成,坝基防渗处理难度很大。为此,针对下坂地深厚覆盖层进行了专门的帷幕灌浆现场试验工艺研究,通过对浆液材料、配比、工艺措施和参数经过深入的分析,找出了一套适合于下坂地复杂地层的灌浆施工工艺,为初步设计提供了可靠依据。

The dam foundation of Xiabandi Hydro - junctionin Xinjiang, which is about 147.95m thick, is a typical deep - thick overburden deposit. It＇s mainly composed of glacio - fluvial deposit layers, alluvial - diluvial soil and gravel, soil lens. The structure is very complicated. In order to find a a appropriate construction technology of curtain grouting to prevent dam foundation seepage, a specific in - situ test process related to deep overburden of dam foundation was carried out. Through the experiment, the grout materal, mixture proportion, construction measures and parameter have been analyzed in detail.