Blasting Roof Cutting Technique and Its Application Effects in Comprehensive Mining Work Faces:Taking the 3307 Work Face of Wangpo Coal Mine as a Case
To address the difficulties in the collapse of the hard roof in goaf areas and the significant deformation of the surrounding roadways,an optimized design for blasting parameters was developed based on the geological conditions of the coal seam in the fully mechanized mining face.A specialized deep hole pre-splitting blasting method for roof cutting was proposed,and on-site experiments were conducted to analyze the effects of roof cutting and pressure relief.The analysis results indicate that after implementing the energy accumulation blasting technology for roof cutting,the surface displacement deformation of the roadway decreased by 30％,the deep surrounding rock displacement of the roof decreased by 37％.Practical application has shown that the arrangement of drilling holes with"guiding holes set between blasting holes"significantly improves the pressure relief effect,enhances the stability of the roadway surrounding rock,improves the roadway conditions,and substantially increases operational efficiency.This technology of energy accumulation blasting for roof cutting and pressure relief can serve as a valuable reference for similar mine pressure control projects.
deep-hole shaped charge blastingroof cutting and pressure reliefexplosion planfield testmining pressure prevention and control
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