Study on seam fracturing and permeability improved technology based on static blasting

In order to improve the seam fracturing and permeability improved effect of the static blasting technology,with the single boreholes breaking,double borehol es breaking and guide boreholes breaking test,the related study was conducted on the static blasting borehole arrangement and fracturing effect. The results showed that t he crack fracturing direction of the static blasting was along a direction to the closest distance free surface. The action force superposition on a line connecting direction be tween the charged boreholes would have great influences to the breaking effect of the specimen,the increase borehole diameter of the charged borehole and the space red uction between the charged boreholes could improve the static superposition breaking effect. The guide borehole would not only have the guide function,but also could enh ance the breaking effect. The network borehole arrangement with the multi borehole arrangement and the guide borehole coordinated arrangement could make the maximu m of the breaking effect. The rational borehole arrangement could obviously improve the fracturing and permeability effect of the static blasting.