Similar Simulation of Gas Migration and Air Leakage Laws for J Type Ventilation System in Goaf

According to the geometric similarity law, sports similarity law and dynamic similarity law, the similar model in goaf is established. J type ventilation way is used in the working face of model, using pressure measurement, the tracer gas, gas concentration sampling test and other means, the gas migration distribution and air leakage laws in goaf under J type ventilation system is studied.