水平帷幕灌浆在砂卵石地层中的应用 及效果分析

对大宁水库防渗工程来说，穿越永定河倒虹吸下部防渗至关重要。为使该灌浆防渗帷幕顺利施工，确保工程质量和进度，在施工之前进行专项课题研究和科研性试验，以了解该部位砂卵砾石覆盖层的地质特性、可灌性和灌浆效果，重点研究灌浆材料、浆液配合比、钻孔和灌浆施工工艺参数等。据此，通过灌浆试验和对灌浆材料、浆液配合比和施工工艺的优选，提出了针对不同地质条件下所采用的相应灌浆方法和技术参数，为帷幕灌浆设计提供了依据，确保了防渗方案的合理性和可靠性。

Application of horizontal curtain grouting to sand-gravel strata and analysis on its effect

The anti-seepage for the lower part of Yongdinghe River Crossing Inverted Siphon is quite important for the anti-seepage project of Daning Reservoir. In order to ensure the smooth construction， construction quality and process of the anti-seepage grouting curtain for it， the relevant special-subject study and scientific experiment are made before the construction of the project， so as to acquire the geological characteristics， groutability and grouting effect of the sand-gravel overburden therein and study on the focus of the parameters such as grouting materials， mixing ratio of gout， hole-drilling and grouting technologies for the grouting construction， etc.. On the basis of this， the corresponding grouting experiment and grouting materials to be adopted for various geological conditions are put forward through the relevant grouting experiment and the optimizations of grouting materials， mixing ratio of grout and construction technology; which lay a basis for the design of the curtain grouting， and then the rationality and reliability of the anti-seepage scheme are ensured as well.