Abstract
The pre-lining method has been applied in a shallow overburden or a soft ground tunnel to prevent surface settlement and stabilize cutting face. The pre-lining is the auxiliary method in which arch-shell linings are formed ahead of cutting face prior to excavation. However, design of this method is not established sufficiently. This paper describes the results of model test and full-sized test to investigate effects of reinforcement for the thin flexible pre-lining. As the results of model test, it is clarified that the pre-lining is effective for face stability and surface settlement. And quantitative estimation method for face stability is proposed.
