Initial supporting structure and supporting method for mountain-crossing highway tunnel in complex area

The invention relates to a complex area mountain-crossing highway tunnel primary supporting structure and a supporting method, and belongs to the field of tunnel engineering.The complex area mountain-crossing highway tunnel primary supporting structure comprises a primary spraying concrete layer, anchor rods, a reinforcing mesh, an arch frame and a re-spraying concrete layer, the arch frame comprises a plurality of steel frame sections, and connecting plates are arranged at the two ends of each steel frame section; the connecting plates between every two adjacent steel frame sections are tightly attached, the connecting plates between every two adjacent steel frame sections are connected through bolts, a connecting box is pre-buried in the initial spraying concrete layer, and the two connecting plates connected through the bolts are fixedly connected into the same connecting box in an inserted mode. The structural strength of the primary supporting structure is enhanced. 本申请涉及一种复杂区穿山公路隧道初支结构及支护方法，属于隧道工程的领域，其包