Analysis of Stability at Tunnel Entrance Due to Different Excavation Methods

The excavation without front slope at the tunnel entrance is presented in this paper. The traditional method and advanced entrance construction method (AECM) are conpared with nurmerical simulations in the construction of Dadongling highway tunnel which located on Hong-You highway in Chongqing. According to the comparison of displacement, stress and stability in the case of without anchoring and shotcreting, the theoretical support of AECM is given.