Abstract: Longdistance largediameter pipe jacking in waterrich quicksand cobble ground needs huge jacking force. In the construction of Yellow River Crossing Pipe Jacking Works on WestEast Natural Gas Transfer Project, the jacking resistance is reduced by means of grouting. The resistance reduction effect is guaranteed by means of proper grouting equipmentn, proper grout slurry mixing proportion, proper grouting pressure control and proper grouting volume control. In the end, the resistance between the steel pipes and the surrounding sand ground is reduced, the jacking force needed is lowered and successful longdistance pipe jacking is realized. 

Key words: waterrich quicksand cobble ground, pipe jacking, grout slurry, resistance reduction by grouting