Influence Law of Structural Inclination for the Construction of Shallow-Buried Highway Tunnel

Abstract

In combination with the construction process of Duanjiawu tunnel of Yiba Express-way, the surrounding rock stability is numerical modeling, by using the FLAC3D software. It is compared that the influence law of different structural inclination for the construction of shallow-buried highway tunnel. The results indicate that dip angle of structural plane has great effect on the displacement, plastic zone and stress field of weak surrounding rock zone, and little effect on hard surrounding rock zone. The displacement ratio of the left side against the right side, which is caused by the difference of lithology, has the greatest effect on the horizontal displacement of tunnel hance, followed by the horizontal displacement of spandrel and least effect on vertical displacement of spandrel.The conclusion can be used for reference for the design construction and research of similar tunnels.