三峡泄洪坝段特殊地质条件下的帷幕灌浆施工

三峡泄洪坝段坝基地质条件较为特殊，总体来看岩体中陡倾角网络状细微裂隙发育，且具有一定的连通性，水泥浆液可灌性较差，易失水回浓，局部范围内涌水较为普遍，部分孔段浆液注入量较大。水泥灌浆施工完毕后，部分坝段仍存在浅层透水率超标现象，采用丙烯酸盐进行补充灌浆后，帷幕的防渗能力可以满足设计要求。

Curtain grouting under special geological condition

The Three Gorges spillway section has a special geological condition featuring developed fine and through net fissures with steep dips, resulting in difficulty in cement grouting, water loss and increase in grout concentration, widely piping at locations and excessive grout takes in some hopes. After operation of cement grouting, excessive leakage in shallow layers occurred locally. The impermeability of the grout curtain could meet the design requirements once the additionally grouting of acrylate was exercised.