Abstract
The long face reinforcement method (FTT method) has been developed to stabilize the mountain tunnel face and to form the reinforced ground zone ahead of the face that restrains the expansion of the influence of the tunneling works to the surroundings. The effectiveness of this method was evaluated on the basis of the measured results obtained from a tunnel in poor geological condition. And also the three dimensional numerical analysis was carried out to verify the measured results.
The outcomes indicate that the long face reinforcement method has the significant effect to restrain the extrusion of the ground ahead of the face, and to reduce the pre-loosening zone of ground.
