Research And Application Of Deep-hole Blasting Antireflection Technique In 3₂ Coal Seam Of Qi-nan Coal Mine

This paper mainly studies the deep hole pre-splitting controlled blasting technology the action mechanism, carries on the numerical simulation and the analysis with the aid of the ANSYS/LS-DYNA finite element analysis software. Theoretically has further analyzed the mechanism which as well as the stress intensity factor change rule under the detonation load function the coal body crevasse's expansion mechanism, in the detonation process the squash area and the crevasse area form; Meanwhile has studied the explosive shock wave, the stress wave through the numerical simulation and explodes the vitality body to the coal body's function. Studied between two detonation holes to explode the stress emphatically between the change, the detonation hole optimum distance, the control hole action mechanism, the stress wave weaken rule. Have studied the deep hole pre-splitting controlled blasting demolition process from the theory and the numerical simulation two aspects as well as it enhance the gas to pull out the putting rate action mechanism.The research indicated: The deep hole pre-splitting controlled blasting technology is through the detonation load function, forms the squash area and the crevasse area in the coal bed, and through the control hole's function, further expanded the crevasse area scope, thus causes the coal bed loose permeability to increase, effective dismantle crustal stress and gas pressure. Increased the gas to pull out to one's limit and pulls out putting rate,has guaranteed the coal mine safety in production finally. It explained this technical is feasible, valid and effective through the scene confirmation. Let this technology become an important mean which can the government gas effectively.