Blastability evaluation for rock mass fragmentation in Iran central iron ore mines  

作　　者：Akbari Majid Lashkaripour Gholamreza Yarahamdi Bafghi Alireza Ghafoori Mohammad 

机构地区：[1]Department of Geology, Ferdowsi University of Mashhad [2]Department of Mining Engineering, Yazd University

出　　处：《International Journal of Mining Science and Technology》2015年第1期59-66,共8页矿业科学技术学报（英文版）

摘　　要：In this research, we investigated the influence of rock mass properties, blast design parameters and explosive properties on blast fragmentation. Rock mass properties were evaluated in 51 blasting blocks using engineering geological mapping of 1961 meters of the scanline, experiments on intact rock samples and measuring P-wave velocity(Vp) for 1771 meters of seismic profiles. The results indicate that increasing spacing, persistence, opening, roughness, waviness of discontinuities, and Vp and uniaxial compressive strength(UCS) of intact rock as well as the increase of discontinuities angle with the bench face of blasting block will increase the size distribution of blasted rocks. In addition, evaluation of the influence of connector type, specific drilling and specific charge has shown that using the Nonel system will decrease the mean size of fragmentation. It is also demonstrated that increasing specific drilling and specific charge quantities will result in the increase of mean size of fragmentation.In this research, we investigated the influence of rock mass properties, blast design parameters and explosive properties on blast fragmentation. Rock mass properties were evaluated in 51 blasting blocks using engineering geological mapping of 1961 meters of the scanline, experiments on intact rock samples and measuring P-wave velocity （Vp） for 1771 meters of seismic profiles. The results indicate that increas- ing spacing, persistence, opening, roughness, waviness of discontinuities, and Vp and uniaxial compres- sive strength （UCS） of intact rock as well as the increase of discontinuities angle with the bench face of blasting block will increase the size distribution of blasted rocks. In addition, evaluation of the influence of connector type, specific drilling and specific charge has shown that using the Nonel system will decrease the mean size of fragmentation. It is also demonstrated that increasing specific drilling and spe- cific charge quantities will result in the increase of mean size of fragmentation.

关 键 词：Rock massBlast fragmentationBlastingSize distributionConnector 

分 类 号：TD31[矿业工程—矿井建设] TD235