Abstract: The case tunnel, crossing underneath Yuelai overpass, is a small-span tunnel, whose foundation pile lies in the middle of the tunnel. Many effective technologies are adopted in the construction on basic of theoretical analysis and site test. In the end, the tunnel successfully cross underneath Yuelai overpass, and has no effluence on surrounding environment. The adopted technologies are feasible for the similar projects.

Key words: tunnel, crossing underneath, overpass, construction technology