Supporting structure of tunnel in bias salt cavity environment and construction method of supporting structure

The invention discloses a supporting structure of a tunnel in a bias salt cavity environment and a construction method of the supporting structure. The supporting structure comprises gate-type frameworks, a steel mesh arranged on the wall of a tunnel and supported by the gate-type frameworks via supporting parts, anchor rods arranged at the periphery of the tunnel and connected into a whole with the steel mesh, and a plurality of anchor cables arranged on the two sides of the tunnel and between the adjacent gate-type frameworks and going deep into a stable batholith from the wall of the tunnel, wherein the two ends of the anchor cables are tensioned on the stable batholith and anchor devices arranged at the inlets of the anchor cables on the wall of the tunnel. By the adoption of the structure, the constructed tunnel is supported in multiple ways, the prestress anchor cables which are tensioned on two sides can adapt to the situation of different pressures on the two sides of the tunnel, the tunnel can be well supported in the same situation, and deformation of the supporting structure and collapse of the tunnel, caused by biasing of the tunnel, are prevented.