There are many obstacles in mine roadway and obstacles h ave significant effect on gas explosion.The paper studied the variation of gas explosion pressure by changing obstacles setting position

distance and number i n pipeline experimental device for the purpose of reducing hazard of gas explosi on

using methane-air mixture.The results show that: when changing obstacles s etting position and distance

explosion pressure has little change.So obstacles setting position and distance have little effect on gas explosion.Explosion pr essure increases with the increasing of obstacles number;when obstacles number is more than 5

explosion pressure has little change.Obstacles number has signi ficant effect on gas explosion

so obstacles should be avoided to set in mine ro adway.