Experiment study on the propagation laws of gas and coal dust explosion in coal mine

In the coal mine, gas explosion can stimulate coal dust participating in explosion and the accident of gas and coal dust explosion usually happens in the heading face. The experiment of gas and coal dust explosion propagation in the alone laneway is carried out in the large experimental roadway which is nearly equal to the fact with actual environment and geometry condition. In the experiment, the time when gas and coal dust explosion flame reaches test points has a logarithm function relation with the test point distances. The explosion flame propagation velocity rise rapidly in the foreside of coal dust segment and come down after that. The length of flame area is about 2 times than that of original coal dust accumulation area. Shock wave pressure comes down to the rock bottom in the coal dust segment, then appears the maximum peak rapidly and comes down. The theory basement of research and assemble of across or explode is supplied by the experiment conclusion. Comparing with gas explosion, the force and destroy degree of gas and coal dust explosion is over larger. Therefore, it is very meaningful for implement of dust fall and prevention technology in the coal mine.