Abstract: Aiming at stemming sealing quality difficult to control, Perforation of the utilization rate is low, easy to appear "wanted" phenomenon or explosives misfire, on the basis of reaserch in the hole plugging mechanism and plugging technology, Changing the structure to optimize the design of stemming, studying the plugging result of wedge stemming by impact test and the blasting test, comparing clay gun mud with wedge stemming, industrial experiment shows that because the wedge stemming improved the blocking effect, hole junior size increased % 10, hole utilization increased by 10%, the charge was reduced by 16.3%. In fact, the result is consistent with the theoretical analysis.which Can provide a basis for engineering blasting,the application of stemming is of great significance.

Key words: Stemming, block, wedge