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《Explosion and Shock Waves》 1993-03
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DETERMINATION OF PRINCIPAL FACTORS AFFECTING THE QUALITY OF ROCK BLASTING WITH GREY CORRELATION ANALYSIS

Zhang Jichun Niu Qiang Xu Xiaohe(Northeast University of Technology, Shenyang, 110006)  
Rock blasting is considered as a grey system and the principal factors affecting the quality of rock blasting are detdermined by the grey correlation analysis in this paper. The fundamentals of the grey correlation analysis and its calculating method are briefly introduced. Taking four field blasting results as examples, the authors calculated their grey absolute correlation grades respectively and obtain the corresponding grey absolute correlation matrixes. Through calculations and analyses, the authors come to the main conclusion as following:1. The grey correlation analysis may determine the relationship between the primary and the secondary of all the factors affecting the blasting quality in different mines and blasting conditions. It supplies a simple and useful method in selecting parameters to controll and predict the blasting quality.2. For multiple blasting quality indexes, usually, two or more factors control the blasting quality. But for a single index, it is necessary that there is a factor which dominantly affects the blasting quality.3. The size indexes of fragments resulting from rock masses blasting are mainly influenced by the distribution of the joints and cracks within rock masses. The space of joints and cracks affects the average and characteristic size of fragments, the length of joints and cracks determines the amounts of big fragments.4. Among all the blast parameters, the hole space and row space as well as the burden play a leading role in the size distribution of fragments. When joints and cracks are not developed within blasting regions, the optimum blasting and the control of fragment size will be realised by adjusting these parameters reasonably.5. Under different charcteristics of rock masses and blasting forms, the same blast parameter plays a different role in the size ditribution of fragments.
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