Experimental Study Of Long-hole Pre-splitting Blast Through Strate In Floor Gateway To Increase Permeability Of The DINGJI Coal Mine

This paper from the increasing permeability of deep-hole presplitting blasting mechanism, computer software simulation, field test and other three aspects, aiming at the wear layer increasing permeability of deep-hole presplitting blasting technology for research and analysis.First of all, introduced the deep-hole pre-splitting blasting in coal seam permeability on the present situation of research and application, mechanism of coal seam gas occurrence and migration theory and deep hole presplitting blasting for foundation, discusses the wear layer of deep hole presplitting blasting technology AR issues than general features of loose blasting, the relevant theory and index parameters were reviewed, and the blasting process of blasting shock wave and stress wave, detonation gas, gas pressure and control hole for fracture initiation and propagation of action are analyzed systematically.Secondly, in Dingji Coal Mine11-2Coal establishes3models as the object of study and numerical simulation experiment of the established model by using the ANSYS/LS-DYNA finite element analysis software. Spacing of different blasting holes with and without control hole for stress wave propagation and particle effects of effective stress by. Research shows that:the wear layer of deep-hole presplitting blasting cavity region, the crushed zone, fractured zone and seismic zone is formed in coal seam, and through the guiding role of control hole, expanding fracture zone.Finally, in Dingji Coal Mine1432(1) floor roadway drilling deep hole presplitting blasting field tests, the test and achieved the desired results, the extraction data have improved significantly, indicating the feasibility of increasing permeability of deep-hole presplitting blasting technology and effectiveness, is an important method to increase coal permeability and improve gas drainage rate.