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Experimental Study on Explosive Stress Wave and Blasting Effect in Coal Mass

Author: WangWeiChao
Tutor: YangXiaoLin
School: Henan Polytechnic University
Course: Geotechnical Engineering
Keywords: Coal Similar simulation Explosion stress wave Simulation test Blasting Mechanism
CLC: TD235.1
Type: Master's thesis
Year: 2010
Downloads: 109
Quote: 0
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Abstract


The The coal blasting theoretical research is still in its infancy , most of the research is to elaborate the of blasting construction process and the effects of the bursting lack of the study of the mechanism of coal blasting hinder blasting coal . In this paper , the mechanism of coal blasting lack of research on this issue , the first literature research , taking fully into account the case of the engineering applications of coal , coal engineering is divided into hard coal , hard coal and soft coal into three categories , and then Finally , in accordance with the ratio of production of coal the model implementation blasting simulation test , Experimental study of the law and blasting the role of coal in the blast wave attenuation based on similarity theory to determine similar material and proportion of coal . On experimental research , blasting the interior of the coal explosion stress wave propagation and attenuation attenuation index of the index is greater than the average rock ; blasting crater test , the critical depth of deformation energy coefficient of coal under the test conditions than the average rock large ; regressed funnel characteristic curve to get the best depth of obtained coal deeper than rock ; based on the degree of rock damage with sonic expression , calculated the damage of coal each measuring point , the results show the same the overall damage value of the coal body dose greater than the value of the overall damage of rock , and detonation gas effect is significant damage to the damage to the coal ; the blasting crater fragments screening statistical results showed that the small size of the fragments , the proportion of coal than large size rock fragments in rocks proportion of more coal ; burst crack length measurements obtained cracks in the total length of the block model , showing internal blasting coal obvious crack length greater than rock .

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