When the bore hole-top-enclosed grouting method is used to conduct high-pressure curtain grouting, shallow weathered broken rock is easy to be split, resulting in excessive grout loss.
采用孔口封闭灌浆法进行高压帷幕灌浆时，对于浅层风化破碎岩体易产生多次劈裂而流失过多浆液造成浪费。
2
Most of the joints in the broken dolomite rock mass were originally tight, to the extent that little grout could be injected.
大多在残破的白云岩岩石大量的联接最初是紧的，在某种程度上可能注射一点水泥。
3
Generally, chemical interactions occurred between foundation rock (including grout curtain) and ground water are the main reason of many time-related engineering problems occurred in dam foundation.