According to the problem of seepage water in tunnel,this paper analyzes the causation and introduces the adopted measure of water shut off with filling grout, sealing leakage toward flow with punching to drying method and self_water proofing mortar float work etc.

The research for the numerical simulation technotloy of high-pressure groundwater sealing grouting;

Through surveying flooding out water below well and designing blocking water scheme as well as reckoning blockage solid thickness and cementation quantity,adopting thrown out slag and cementation sealed backing method,flooding out water was successfully backed.

In addition,from the determination of the treatment length and width of gob,arrangement of grouting holes,grouting technology,related parameters and other aspects discussion is made in order to provide references for works with similar geological conditions in the future.

To prevent pipes from thrusting out of grouting hole due to the injection pressure while grouting operation being conducted, certain measures of fixing grouting pipes should be taken.