Prefabricated continuum model box for simulating underground structure under combined action of fault and seismic oscillation

The invention discloses a prefabricated continuum model box for simulating an underground structure under the combined action of fault movement and seismic oscillation, and belongs to the field of rock-soil seismic engineering. The device comprises two end boxes arranged on two adjacent vibration table tops and a middle box connected with the two end boxes. The end box is a layered shearing box formed by connecting multiple layers of U-shaped frames, the adjacent frames are connected through sliding rails, and horizontal shearing of a soil body can be effectively simulated. The middle box is a flexible connection box and is composed of a plurality of layers of rectangular steel frames, all the frames are connected through telescopic devices, the end boxes and the middle box are connected through telescopic devices, meanwhile, sliding ways are arranged at the corresponding connecting positions, and the influence of fault movement is simulated through relative displacement between all the frames. In order to re