Large simulation test acoustic emission device for multi field coupling coal mine dynamic disaster

The invention discloses a large simulation test acoustic emission device for a multi field coupling coal mine dynamic disaster, and the device comprises a test piece box body, wherein the box body is provided with a probe mounting hole; a plug is welded at one end, which is near the inner cavity of the box body, of the probe mounting hole; one end, which is far away from the box body, of the probe mounting hole is provided with a first bolt in a matching manner; the outer side of the plug is provided with an acoustic source probe; a spring is subjected to press fitting between the acoustic source probe and the end surface of the first bolt; the first bolt is provided with a first axial through hole; a second bolt is arranged in the first axial through hole in a matching manner; the secondbolt is provided with a second axial through hole; and a circumscribed lead of the acoustic source probe is led out from the first axial through hole and the second axial through hole. According to the large simulation test acoustic emission device, the time-spatial revolution rule of the acoustic emission signal of the coal-rock mass before and after the coal mine dynamic disaster happens can bemonitored so as to achieve the purposes of researching internal relation among a stress field, a seepage field, a temperature field and a fracture field and the mutually-coupling action mechanism in the coal mine dynamic disaster process.