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九甸峡水利枢纽大坝混凝土防渗墙工程,施工平台低于上下游围堰25m,设计墙体两端嵌入两岸坡度80～85°的陡峭基岩0.8m,施工面临在陡坡嵌岩和在砂卵石饱和水地层动水条件下成槽等技术难题,通过采取地下预裂爆破和预灌浆技术进行施工,取得良好效果,为丰富防渗设计和施工积累了经验。
The project of concrete impervious wall of dam in Jiudianxia Water Control Project is 25m lower than that of the upstream and downstream cofferdam. Both ends of the wall are designed with 0.8m steep bedrock with a slope of 80-85 ° on both sides of the wall, Sandstone and pebble saturated water stratum under the conditions of water into the groove and other technical problems, through the use of underground pre-cracking blasting and pre-grouting technology for construction, and achieved good results in order to enrich the seepage control design and construction has accumulated experience.