Industrial Contrast Test of Deep Hole Pre-splitting Blasting Technology and Hydraulic Fracturing Technology

In order to solve the technical problems of hard caving roof, the contrast tests of deep-hole pre-splitting blasting and hydraulic fracturing were adopted for the initial roof caving. The results showed that the forced caving rocks form the deep-hole pre-blasting technology could fill the mined-out area at the back of the hydraulic support, they effectively weakened the impact effect of the dynamic load by the first weighting, and they could avoid the formation of a hurricane, but the safety was poor and they could produce toxic and harmful gases. Because of the optimized design and construction of directional hydraulic fracturing technique, the roof strata were weakened effectively, and the roof integrity was destroyed. The roof strata could timely and hierarchically caved along the advance process of working face, and they could reduce the impact on the hydraulic support.