The Development And Application Of Experimental Platform For Similar Simulation Of Goaf Gas Seepage

In allusion to the widespread phenomenon of coal spontaneous combustion in goaf, inorder to further grasp the law of goaf gas seepage and provide theoretical basis for disasterprevention and control. This thesis studied the subject of air leakage distribution in U typeventilation face goaf. On the basis of similarity simulation theory and method, through theindependent developed experimental platform for similar simulation of goaf gas seepage,conducted the goaf gas seepage law. The result fit well with the site experiment. Theexperimental platform is scientifically and it provides a new research method for this area.The design ideas of this platform is “three dimensions, naturally roof-fall,comprehensive monitoring”. The platform is composed of four part, they are experimentbox, mining system, ventilation system and monitoring system. The boundary condition,ventilation quantity and air leakage point is adjustable. This design let the platform can dodifferent experiment for different prototype and do repeated test with simple variablemethod.This experimental platform has great innovation on experiment method. The goafmodel is making by similar materials with certain proportion. And with the manual miningsystem it can simulate the strata and mining condition. So it can form a desired goaf modelby natural roof-falling and using the tracer gas monitoring technology to get known of theair leakage law.On the basis of the successful establish of the platform, simulated the air leakagecondition of U type face, and obtained the air leakage distribution pattern of horizontal andvertical in goaf. From such an analysis, divides three characteristic regions as follow. First,the air leakage intensity is asymmetric in the loose triangle of two side chain wall and freshair side is greater than air return side. Second, there exists an air leakage amass region nextto the support. The air flow by this region and go back to return air. Third, behind the uppercorner and20-30m range wide the wind direction changed to upper corner because of the negative pressure effect.