Cavern impact dynamic response test device and test method under complex conditions

The invention belongs to the technical field of underground cavern impact dynamic tests, and particularly relates to a cavern impact dynamic response test device and method under complex conditions, the device comprises a multi-degree-of-freedom impact mechanism, a complex stress simulation box and a variable-shape cavern model, and the impact mechanism is provided with an impact hammer and an adjustable support. The impact load change is realized by changing the impact height and the impact speed of the impact hammer, and the change of different impact positions can be realized by adjusting the vertical and horizontal positions of the impact hammer; and two lateral movable side plates and a pressure applying hydraulic mechanism are arranged in the box body. According to the invention, the model test of the deformable cavern under the impact power under the complex crustal stress adjustment is realized; the stress state and cavern burial depth adjustment of the variable-shape cavern model is realized through