ANALYTICAL STUDY OF NATM

An analytical method to estimate earth pressures and displacements of steel supports and shotcrete executed by the New Austrian Tunneling Method (NATM) is proposed considering not only mechanical properties of linings and the ground but also some design conditions. Because the analytical results can be verified by field measurements, this method is adequate for engineering applications. Therefore, such design parameters as the interval of supports, the thickness of shortcrete, the advance velocity of a tunnel and the distance between tunnel face and location of lining construction may be effectively determined by the proposed approach.