Physical model test device and method for ground fissure earth tunnel

The invention discloses a physical model test device for ground fissure earth tunnels comprising a model box in a model device. A footwall soil mass and a hanging wall soil mass are symmetrically arranged by a vertical shaft in the model box, a simulation ground fissure is arranged between the footwall soil mass and the hanging wall soil mass, a fixed bottom plate is installed below the footwall soil mass, and a hanging wall soil mass supporting plate in a sedimentation device is installed below the hanging wall soil mass; an air pressure sac is arranged among an upper cover, the footwall soil mass and the hanging wall soil mass; a tunnel portal is horizontally arranged on the cylindrical side wall of the model box, the axial line of the tunnel portal is perpendicular to the vertical shaft of the model box, the tunnel portal is internally provided with a model tunnel lining structure, and various sensors are arranged. The invention also discloses a physical model test method for the ground fissure earth tunne