Abstract: The regression analysis method can provide an effective guidance for the changes in the tunnel design and construction. This paper presents a case history of the construction displacement monitoring at the top of the Wujialing Tunnel in 03A Bid Document in DanjiangkouTusiya(DanTu)primary highway.During the tunnel excavation,the time effect on the deformation in the New Austria Tunneling Method(NATM)was applied in the construction and the regression analysis was performed on the deflection data collected at the crown of the tunnel.The time relationships with the surrounding rock mass are obtained.These relationships can provide guidance for the subsequent design and construction changes.

Key words: Tunnel Excavations, New Austria Tunneling Method, Deflection at Crown, Regression Analyses