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Dynamic Numerical Simulation of Water-coupling Cutting Blasting in Quarry

Author: WangShiWen
Tutor: FangZeFa
School: Wuhan University of Technology
Course: Mining engineering
Keywords: Stone cutting blasting No coupling coefficient Critical stress Dynamic Simulation
CLC: TD235.3
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract


Cutting blasting blasting parameters by a reasonable choice, coupling charge structure kerf control blasting method rock formation along a predetermined direction with the cutting surface is smooth, no damage or rock damage small cutting surface on both sides of the advantages. Cutting blasting presplit (glossy) based on blasting blasting technique developed more widely used in stone mining is a very promotional value of blasting technology. This thesis is optional advanced dynamic numerical simulation of computer software to further understand the mechanism of cutting blasting into the seam, hole distance and not coupling coefficient changes focus on blasting effect of water coupling, the significance of both theoretical and practical engineering significance . The papers as the research object to Shandong wulian granite stone mining in cutting blasting, cutting blasting into the seam the Mechanism and blasting parameters change cutting blasting quality, according to the project actually established a quasi-planar isotropic elastic material strain model, explicit dynamic finite element program, detailed calculation and analysis of the dynamic stress in the middle of the two holes and the surrounding rock mass in the role of dynamic load distribution and its variation as a tool for simulation, while the use of fracture Theoretical Mechanics cutting blasting into the seam mechanism analysis, to explore the the blasting parameters change blasting effect. The main research results and conclusions include: the initial stress of the hole wall and the quasi-static stress field calculation analysis coupled blast of air and water, under the conditions of the same charge and the air charge coupled blasting compared aqueous medium coupled The initial stress acting on the hole wall blasting and quasi-static stress field are much larger than the air coupling, while the longer duration of action. Calculated by fracture mechanics theory adopted the granite medium artillery holes selected unit dynamic crack initiation critical pressure, critical driving pressure and the pressure of the critical crack crack crack arrest of crack propagation and come with computer software simulation. The pressure of the unit at the comparative analysis, to draw water decoupling cutting blasting process from the crack tip crack, expand and crack arrest conditions. Cutting blasting adjacent blasthole detonate at the same time generates the superimposition of the stress of the region between the two holes, hole with the stress at the midpoint of the center line value is significantly greater than single blasthole blasting at the same position when the stress. Stone cutting controlled blasting, not coupling coefficient or Pitch hours will appear blasthole wall of the predetermined direction of crack propagation, not coupling coefficient or Pitch is too often lead to two blasthole can not be formed through the cutting surface . Therefore reasonable to choose not coupling coefficient, gun hole spacing can be more a more focused role in crack propagation of the explosion energy guarantee kerf formed between blast holes at the same time reduce the blast damage to the rock mass damage.

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