The Effect of TAS Method by a Supplementary Method to Tunnel

Generally, it is known that urethane injection is an excellent method in long-term durability and environmental characteristics for ground improvement. However, urethane grouting has short rise-time that is, reaction time of solution A and solution B is short, and the injection distance is very short. Therefore, urethane injection cannot be used for the site where locates deeply from the initial injection point in a ground. Other injection materials such as cement cannot apply an alternative material when rapid hardening is required. From this study, disadvantages of urethane injection could be improved by TAS method. From the results of field tests, it was known that TAS increases injection distance over 10m, which is longer than that of original urethane grouting. In addition, the rise-time of TAS is shorter than that of cement grouting, so rapid improvement can be gained from TAS. Short rise-time and long injection distance of TAS can give excellent applicability for tunnel construction.