Uniformly distributed loading test system for tunnel lining structure

The utility model discloses a uniformly distributed loading test system for a tunnel lining structure. The system includes a pressurization system, a model box and a tunnel lining arranged inside the model box, the pressurization system is steel frame pressurization system and mainly consists of boundary beams, a top beam and an oil cylinder, the model box includes six panels and a force transfer plate, and the bottom is provided with pulleys; the tunnel lining is arranged in the model box; fillers between the model box and the tunnel lining are water, oil or lubricating grease, and the model box is a sealed model box on which sealing treatment is performed. By changing a force transfer medium, the airtightness of the model is improved, direct control of approximately uniformly distributed pressurization at the back of the lining and loading pressure at the back of the lining and a large-scale similarity model test can be realized, and the uniformly distributed loading test system for the tunnel lining structure can be used for studying load-carrying performance and structural design of the tunnel lining, load-carrying performance of a diseased tunnel lining structure in operation, a lining crack propagation test and a large-scale flexibility reinforcing (carbon fiber, steel belt) test.