Evaluation and optimization of blasting approaches to reducing oversize boulders and toes in open-pit mine  

作　　者：Zhendong Leng Yong Fan Qidong Gao Yingguo Hu 

机构地区：[1]College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,China [2]China Gezhouba Group Explosive Co.,Ltd.,Chongqing 401121,China [3]School of Highway,Chang’an University,Xi’an 710064,China [4]Yangtze River Scientific Research Institute,Wuhan 430010,China

出　　处：《International Journal of Mining Science and Technology》2020年第3期373-380,共8页矿业科学技术学报（英文版）

基　　金：supported by Chinese National Natural Science Foundation (No. 51809016 and No. 51979152);Chongqing Municipal Natural Science Foundation (No. cstc2019jcyjmsxmX0645)

摘　　要：A new blasting approach of combined blastholes with different diameters is proposed to solve the problems of oversize boulders and rock toes in open-pit mine. A non-ideal detonation model and a statistical damage constitutive model are implemented in dynamic finite element analysis to investigate the formation mechanism of oversize boulders and toes. The damage distribution and evolution process of rock blasting fragmentation is simulated, and the scheme is further optimized. Numerical analysis results showed that pocket charges and satellite blastholes can only improve bench top fragmentation, but they cannot reduce the oversize in the middle and bottom of bench as well as the toe problem. The new blasting approach of combined blastholes with different diameters can effectively reduce the oversize boulders and toes as well as the production costs.

关 键 词：Rock blasting Blasthole diameter Oversize boulders Rock toes Damage distribution 

分 类 号：TD235[矿业工程—矿井建设] TD804