Construction method for shallow-buried underneath passing of xigeda stratum through earth surface large structure

The invention relates to the technical field of tunnel construction, in particular to a construction method for shallow-buried underneath passing of a xigeda stratum through an earth surface large structure. The method comprises the following steps of step 1, advanced geological forecast; step 2, hole body excavating; step 3, primary supporting, wherein arch frame full-ring supporting is adopted, adjacent arch frames are connected through connecting ribs, a plurality of first feet-lock anchor pipes are arranged at arch feet of steps and at the two sides of each arch frame, a longitudinal arch frame is in lap joint between every two adjacent arch frames at arch feet of the steps, anchor pipe holes are reserved in the longitudinal arch frames, after concrete is sprayed, second feet-lock anchor pipes are arranged at the anchor pipe holes, and the pipes are grouted and sealed; and step 4, lining of a secondary lining, wherein after the second feet-lock anchor pipes are installed, tunnel settlement can be effectiv