Expanded base pile and anchor rod composite foundation for large-gradient mountain flexible support

The utility model relates to the technical field of civil engineering, in particular to a pedestal pile and anchor rod composite foundation for a large-gradient mountain flexible support. Comprising a reinforced concrete columnar foundation vertically inserted into a slope surface, and the columnar foundation comprises a straight section and an expanded base section located at the lower end of the straight section; the expanded-base section is of a big-end-down conical structure, the upper end of the expanded-base section is equal to the lower end of the straight section in diameter, the lower end face of the expanded-base section is of a spherical-arc-shaped pot bottom structure, and a plurality of anchor rods are evenly arranged in the expanded-base section; the upper end of the anchor rod extends into the expanded-base section and is fixedly connected with the reinforcement cage in the expanded-base section in a crossed mode, and the lower end of the anchor rod is vertically inserted into a rock body below