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| RESEARCH ON BLASTING CONTROL TECHNIQUE AND BLOCK SIZE PREDICTION OF DIFFERENT DIMENSIONS STONES |
| CAI Jiande1，2，ZHENG Bingxu2，WANG Xuguang1，LI Pingfeng2 |
(1. School of Civil and Environment Engineering，University of Science and Technology Beijing，Beijing 100083，China；
2. Guangdong Hongda Blasting Engineering Co. Ltd.，Guangzhou，Guangdong 510623，China) |
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Abstract According to problems of different dimensions stones mining of many engineering requirements，on the background of the Tielu port quarry，the site investigation，engineering test，mathematical model prediction and blasting control technique are used to study efficient blasting mining techniques. Before construction，the blasting area is divided into different sizes stones in the mining region according to investigating result and blasting crater test，drawing fragmentation map of different sizes stones mining and improving the efficiency of the specifications stone mining. With Kuz-Ram mathematical model，the relation between the blasting design parameters and the percentage of different sizes block stones after blasting is established. Based on the relation，blasting fragmentation and blasting effect can be predicted by blasting parameters. Simultaneously，the blasting parameters are optimized by the prediction results. The decoupling and nonuniform charge collapse blasting to reduce the rate of ore powder is studied during construction；and the mechanism is analyzed. The collapse blasting of the decoupling and nonuniform charge structure can reduce the ore powder and cost，by comparing the blasting effects of coupling charge，the hole charge and the decoupling and nonuniform charge structure. The field application shows that these techniques can meet the engineering requirements and bring economic benefits.
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2012, Vol. 31 
