水平帷幕灌浆在砂卵石地层中的应用及效果分析

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

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。

The anti-seepage for the lower part of Yongdinghe River Crossing Inverted Siphon is quite important for the anti-seep- age 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 grou- ting construction, etc.. On the basis of this, the corresponding grouting experiment and grouting materials to be adopted for vari- ous 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.