Influence Law of Structural Inclination for the Advanced Excavation Method of the Tunnel

A deep-buried highway tunnel is constructed with complex geological condition which existing an alternation of soft and hard rock and having feature of high ground stress, and extrusion, fall-block and twisted phenomena of supporting structure appear in many places during construction which pose a serious threat to the safety of tunnel construction. In combination with the construction process of Shimenya tunnel, by using the finite difference software FLAC3D, the surrounding rock stability is simulated, and the numerical calculation results of advanced pilot excavation method with different structural inclinations. The conclusion can be used for reference for the design and research of similar tunnels.