Study Of Cabin Structure And Gastightness Of Mobile Refuge Chamber For Coal Mine Under High Explosion Pressure

Being placed in the mine roadway, coal mine refuge chamber is the lifesaving equipment whichprovides a safe and respirable sealed space in case of mine tragedy. The object blasting test method usedin identifying the strength of the chamber is destructive test by consuming lots of human resources andmaterials. The theory study on the chamber is not rich and no anti-explosion design standard is given,which are just part of the difficulties and unsure practices in the structure design of the chamber and itssimilar products.As for the above issues, combined with the study in Specifications for Coal Mine Mobile RefugeChambers, this paper takes advantage of the theoretical calculation, real experiments, numericalsimulation to study the calculation method on mobile refuge chamber in roadway under load impact toget the results of finite element calculation, real experiments and theoretical calculation and to prove thecalculation feasibility based on the results comparison validation, which provides the checkingcalculation methods and design reference for the chamber and its similar products.The finite element calculation method is given for the chamber under coal dust and gas explosion.This method has been testified by real blasting experiment and the semi-empirical formula for plasticdeformation of simple shell structure under the blasting load. By analyzing and comparing the chamberswith various structures based on the above calculation method and formula, it is given that theanti-explosion capability of trapezoidal chamber is better than that of flat top chamber and arc chamberand the strength of reinforcing rib contributes the most to the anti-explosion capability. Meanwhile thecapsule gastightness of entry door is directly proportional to the numbers of interlocking gears and thestrength of doorframe.This paper combines the theoretical calculation, numerical simulation with real blastingexperiments to put forward clearly the finite element calculation method on the strength of mobilerefuge chamber for the first time and to compare and analyze the influence factors on the chamber underblasting load, based on which the most favorable structure of mobile refuge chamber is given to providereference for future chambers, mobile protection supply chamber and similar products design.