Experiment on mining by the air-space blasting in tonstein coal seam

Abstract：By using blasting mechanics theory and elastic wave theory, the theory and the effect of air-spacing blasting is studied.According to the blasting theory, some practical experiments have been done in the spot of Liangzhuang coalmine, in which there were some abnormal gangues in the coal and many problems with the blasting technology, such as the bad efficiency of blasting.In order to improve the circle depth, decline the waste amount of waste rock thrown away and explosive, the blasting parameter by changing the direction of explosive and distance between blasting holes and the position of explosive in the hole is analyzed and optimized.Finally, a good result is obtained, which improved the outputs of Liangzhuang coalmine.

Keyword：tonstein coal seam;blasting parameters;air-spacing blasting;second stress wave;