预灌浓浆在糯扎渡水电站防渗墙施工中的应用

Before the cut-off wall construction of the Yunnan Nuozhadu Hydropower Station upstream cofferdam,the cofferdam’s filling layer and the two sides of the bank’s slope plot had been pre-grouted with thick slurry.So during the construction of the cut-off wall,the phenomenon of the slurry leakage and the collapse of the cut-off wall notches were widely reduced,providing a great convenience to the cut-off wall construction.At the same time, the length of the node construction had been effectively reduced and won more time for the follow-up cofferdam construction.In this paper,the cut-off wall pre-grouting thick slurry construction technique and the improvement of the process had been described in detail.