Half-bright and half-dark tunnel protection structure

The utility model relates to a half-open and half-dark tunnel protection structure, belongs to the technical field of highway tunnel design and construction, and solves the problems of long construction time and unstable quality caused by cast-in-place retaining wall in the existing construction method. A half-open and half-dark tunnel protection structure comprises a pile foundation and an assembly type retaining wall. The pile foundation is connected with the assembly type retaining wall, the assembly type retaining wall comprises a concrete pouring channel and a first groove, the concrete pouring channel is arranged in the assembly type retaining wall, and the first groove is formed in the position, corresponding to the pile foundation, of the bottom of the assembly type retaining wall. According to the utility model, the excavation volume of the highway tunnel passing through the steep road section is effectively reduced, and the safety of half-bright and half-dark construction of the highway tunnel is im