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Mechanism and Application Researches on Fracture Propagation of Deep-hole Pre-splitting Blasting in Coal Seam

Author: WangZhiLiang
Tutor: ZhouXinQuan;XuJingDe
School: Beijing
Course: Safety Technology and Engineering
Keywords: Blasting Into sewing mechanism Parameter design Optimization
CLC: TD235.33
Type: PhD thesis
Year: 2010
Downloads: 708
Quote: 0
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Abstract


Seam splitting blasting objects containing gas of coal , gas and coal medium of gas-solid coupling relationship will inevitably affect the expansion of blasting cracks , crack propagation of the coal body directly determines the storage and transport of gas state , which impact of coal seam permeability and gas drainage effect , thus containing the the gas coal crack propagation mechanism study is the theoretical basis of pre - splitting blasting coal seam . Based on the physical and mechanical properties of gas - containing coal , gas desorption in coal vivo , diffusion and percolation process , the establishment of a mathematical model of the fluid-structure interaction of gas in coal seams in the migration process . Based on the explosion and fracture theory , the damaging effects of the shock wave of the blast near zone of the coal seam Blasting COSCO crack propagation constitutive relations . By theoretical analysis of the main parameters that affect coal crack propagation . The ultra dynamic strain , blasting holes with control hole spacing arranged experimental studies ; established coal blasting crack propagation model embedded DYNA program , the numerical simulation of the expansion process of the fractured , its results verify the theoretical model correct and rationality . The seam splitting blasting crack propagation research applied to optimize blasting design , combined with the actual situation of Mine engineering practice in the field of gas drainage . The research results for the low permeability coal seam gas extraction research is important .

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CLC: > Industrial Technology > Mining Engineering > Mine design and construction > Drilling and blasting works > Blasting > Blasting method > Deep Hole Blasting
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