乌东德水电站特高拱坝全坝无盖重固结灌浆技术研究与应用

Research and Application of Consolidation Grouting Technology without Cover Weight for Ultra-high Arch dam of Wudongde Hydropower Station

针对乌东德水电站特高拱坝固结灌浆存在的问题,分析了坝基开挖松弛特征,通过室内材料试验和现场工艺试验,研发了裸岩裂隙封闭材料与工艺,解决了无盖重固结灌浆压力低、效果差的难题,提出了“表封闭、浅加密、深升压、少引管”全坝无盖重固结灌浆方法,不仅保证了坝基固结灌浆质量,而且不用占压混凝土仓面,解决了有盖重固结灌浆与混凝土浇筑施工相互干扰的难题,在乌东德水电站特高拱坝坝基固结灌浆中成功应用,可供同类工程参考借鉴。

In view of the problems existing in the consolidation grouting of the ultra-high arch dam of Wudongde Hydropower Station,the relaxation characteristics of dam foundation excavation are analyzed.Through indoor material tests and field process tests,the materials and processes for sealing the cracks in bare rock are developed,which solves the problems of low pressure and poor effect of the consolidation grouting without cover weight,and puts forward the method of"surface sealing,shallow densification,deep pressure rise,less lead pipe"for the whole dam without cover weight consolidation grouting,which not only ensures the quality of the consolidation grouting of the dam foundation,Moreover,it does not occupy the concrete warehouse surface,and solves the problem of the interference between the covered consolidation grouting and the concrete pouring construction.It has been successfully applied in the consolidation grouting of the dam foundation of the ultra-high arch dam of Wudongde Hydropower Station,which can be used as a reference for similar projects.