Abstract
It is expected to develop the reliable reinforced method to decrease the surface settlement on the shallow tunnel in urban resion. A new pre-lining method which can make the continuous arched body on the top of the face has been developed. It makes a reverse T type body by using the high pressure grouting with three direction nozzle. The reverse T type body is not only economical shape but also effective function in a complex with the ground.
The grouting test was carried out in the imitation ground to see the shape of improved body and the effect. The model test chaging the shape of the reinforcement was carried out to investigate the effect of this pre-lining method. This paper describes the result of fullsized test and the model test.
