Load-carrying capacity test device of tunnel secondary-lining concrete structure

The invention relates to a load-carrying capacity test device of a tunnel secondary-lining concrete structure, comprising a pressure box, a hook, a hanging rod, a spring balance, a stack loading platform and a stress strain meter, wherein the pressure box is fixedly buried between a tunnel waterproof layer and the secondary lining concrete, the hook is fixed on the secondary lining concrete, the hook is connected with the hanging rod, the hanging rod is connected with the stack loading platform through the spring balance, the stress strain meter is arranged on the surface of the secondary lining concrete, the stack loading platform is loaded step by step to obtain the data of each instrument, the actual measurement valve and the theoretical calculation value are compared, and the load-carrying capacity of the secondary lining concrete is illustrated through a linear curve. The device can effectively test and detect the load-carrying capacity of a tunnel secondary lining concrete structure and is a lossless test and detection device, does not destroy the original tunnel secondary lining concrete structure and can provide important scientific evidences for design, construction and construction completion acceptance.