Multi-disaster coupling experiment system for simulating tunnel and experiment method of multi-disaster coupling experiment system for simulating tunnel

The invention discloses a multi-disaster coupling experiment system for simulating a tunnel. A test piece is placed in the experiment system, the test piece is of a tubular structure, the test piece is formed by splicing a plurality of axially aligned whole-ring segments, a gap between two adjacent whole-ring segments is an annular gap, each whole-ring segment is defined by a plurality of arc-shaped segments, a gap between the two adjacent arc-shaped segments is a vertical gap, the adjacent arc-shaped segments are connected in series through connecting bolts, the system comprises a reaction wall, a pressurizing device is arranged between the test piece and the reaction wall, a vibration simulation device is arranged inside the test piece, a fire experiment simulation device is arranged atthe top of the test piece, liquid corrosion devices are arranged at the annular gap and the vertical gap, and electric corrosion devices are arranged on any connecting bolts. According to the solutionof the multi-disaster cou