Abstract
It is important to consider the relation of a excavation speed and a hardening velocity of shotcrete when it evaluates supporting effects of shotcrete to get stability after excavation. Therefore, in this study, it was analyzed by using sequential excavations and supports with an axisymmetrical model for new type shotcrete which developed rigidity by a short time and ordinary shotcrete. These types of shotcrete were compared with each other in terms of effectiveness for supporting the ground.
As a result, the former type of shotcrete was found to be more effective for ensuring the stability of the ground around the tunnel because it provides great reaction forces near the face.
