抄録
“Pre -reinforcement behind the face” using long steel pipes and consolidations, known as umbrella method, is a technique which has been widely used in the last few years, since the tunnel has to be constructed nearby urban area where the environment protection is severely restricted. Although the fact, we have had few data regarding the method and haven't grasped the real effect of it yet.
This paper presents some notes of TREVITUB method, one of the umbrella method, by adapting it to the small overburden and loose soil tunnel construction. Moreover, focusing on the behavior of the steel pipes, the authors discuss about surcharge on the pipes and the design model of the method.
