Supporting structure of tunnel portal of power plant circulating water system

The utility model relates to a supporting structure of a tunnel portal of a power plant circulating water system. The supporting structure comprises a steel arch frame, and a part of the steel arch fame is arc-shaped. The supporting system is characterized in that a plurality of cement mixing piles are arranged on areas near the top and the two sides of the tunnel portal to form a cement paste mixing reinforcing area; the top of the tunnel portal is provided with a plurality of grouting anchor rods to form a portal top grouting anchor rod reinforcing structure; a plurality of long pipes are arranged on the arc area of the top of the tunnel portal to form a long pipe shed structure; the two sides of a portal inlet channel outside of the tunnel portal are provided with multiple soil-retaining cast-in-place piles to form a soil-retaining support of the portal inlet channel outside the tunnel portal; the steel arch frame, the cement paste mixing reinforcing area, the grouting anchor rod reinforcing structure, the