Simulation Experiments Study On Permeability Improvement Technology Of Deep Hole Pre-splitting Blasting

This paper, stating from mechanism of deep Presplit Blasting AR, computer software simulation, simulation experiments, etc, studies and analyzes the low permeability coal seams deep Presplit Blasting techniques,based on rock mechanics, mechanics of explosion, theory of resemble simulation and other theories.Firstly, introduces the deep pre-split blasting AR technology existing research and application, analysis summarizes the seams after the explosion, the role of the detonation shock wave, detonation gas, gas pressure and controlling the original hole in the seam of explosives AR and mechanism.Secondly, nalyses and summarizes the theory of simulation. In order to ensure the reliability of the experimental results to the largest extent, in the process of similar simulation experiment, experimental model of the building and the actual prototype must follow the rule of analog simulation experiment, each of the physical and mechanical property between model and prototype has to meet the similar proportion of the various physical and mechanical characteristics value.Third, based on the similar simulation theory for the mechanical properties of coal seam in Huainan Mining Area13-1, similar simulation experiment platform is built in laboratory, and then carries on the deep hole pre-splitting blasting simulation experiment, obtains blasting crack propagation situation of different hole spacing. Based on acoustic emission change law of qualitative analysis between before and after blasting, deep hole pre-split blasting in coal seam are studied anti-reflection effect and through the strain change rule of the strain brick measured by strain brick, analyzes the strain change rule under the circumstance of different hole spacing.Fourth, using numerical simulation software Ansys technology to build deep hole presplitting blast blasting model and to make calculation, researching the expansion of the crack and the changes of stress after only the blasting hole and deep hole pre splitting blasting with different hole spacing, receiving reasonable deep pre-split blasting hole spacing by contrast.