Study Of Ultra Deep Hole Loose Blasting In Under Ground Coal

From the basic theory of blasting rock, this paper expounds the principle of loose blasting, andconnecting with the field blasting test, the level of underground coal seam fully mechanized face deephole loose blasting technology were studied.First introduces the origin and development of engineering blasting, expounds the currentengineering blasting technology at home and abroad the development of the theory and practice, andputs forward the trend of the development of engineering blasting technology.Follows on from theexplosion stress wave refraction and the expansion of the gas explosion effect and interaction in theprocess of the three aspects of blasting both basic mechanism of fractured rock mass is systematicallyanalyzed. At the same time, through the compare loose blasting and normal blasting, definition of looseblasting are introduced.In order to be able to maximize improve the utilization rate of blasting energyand achieve the ideal loose blasting effect, based on the theory of blasting parameters, hole charge, blasthole depth, resistance wire, perforation density coefficient, charging structure and hole blockage etc)selection are analyzed, and combining region banner WenMing underground coal mine fullymechanized working face1301actual situation, determine the level of super deep hole loose blastingparameters.For the convenience of super deep hole charge, this article proposed to the conventionalexplosives in secondary processing, namely by making long cartridge, and design the auxiliary machineto speed up the loading schedule. At the same time, in order to improve the blasting of deep hole looseblasting and explosive reliability and stability, super long charge internally and super long chargebetween the explosive devices were designed.Finally, through the field test and evaluate the test result analysis, further to the theory ofunderground coal mine ultra deep hole loose blasting technology was optimized. Therefore, this articleresearch results can provide beneficial reference for the similar engineering practice.