Abstract: The problem of dam seepage was serious with Fengman dam. To eliminate seepage, sealed orifice grouting was adopted. The result showed that it was of the advantages such as high efficiency and grouting repetition of different dam sections, which ensured grouting quality and good effect.

摘要： 丰满大坝坝体渗漏、溢流面冻胀等问题很突出。溢流面降低渗水压力工程主要是拦截坝体渗漏水量，加强坝体排水，有效降低坝体渗透压力。孔口封闭灌浆工艺更适合高压、浓浆的灌浆设计技术要求。实践证明，该工艺在丰满大坝溢流坝段帷幕灌浆工程中体现了效率高、各段次重复多次灌注等优点，保证了灌浆质量，达到了预期的效果。