The invention relates to a supporting structure of a tunnel opening of a power
plant circulating water
system and a construction method. The supporting structure comprises a steel arch, wherein a part of the steel arch is arc-shaped. The supporting structure is characterized in that a plurality of
cement stirring piles are arranged around the top and the two sides of the tunnel opening to form a
cement grout stirring reinforcing area; the top of the tunnel opening is provided with a plurality of grouting anchor rods, and accordingly a grouting anchor rod reinforcing structure at the top of a tunnel is formed; a plurality of long tubes are arranged on the arc area of the top of the tunnel opening, and a long
pipe shed structure is formed; a plurality of soil blocking cast-in-place piles are arranged on the two sides of a tunnel
inlet channel outside the tunnel opening, and a soil blocking support of the tunnel
inlet channel outside the tunnel opening is formed; the steel arch, the
cement grout stirring reinforcing area, the grouting anchor rod reinforcing structure, the long
pipe shed structure and the soil blocking support are connected into a whole through concrete, and accordingly the supporting structure of the tunnel opening of the power
plant circulating water
system is formed. Soft soil is dug in a certain rage of the tunnel opening, the soft soil in a limited range of the tunnel opening is reinforced in special technical measures, and a safe tunnel opening structure is formed; the position of the tunnel opening does not need to be adjusted, the
route of the tunnel does not need to be changed, and the supporting structure and the construction method have the advantages that project investment is little and design and construction are convenient to carry out.