Comprehensive determination method of blasting-roof thickness in deep hole mining and its application

被引：0
|
作者：
Wang W. [1 ]
Luo Z. [2 ]
Qin Y. [2 ]
Xiang J. [3 ]
机构：
[1] Jiangxi Copper Technology Research Institute Company, Nanchang, 330096, Jiangxi
[2] School of Resources and Safety Engineering, Central South University, Changsha, 410083, Hunan
[3] Fankou Lead-Zinc Mine, Shaoguan, 512325, Guangdong
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2019年 / 36卷 / 01期
关键词：
Blasting-roof; Deep hole mining; Dynamic numerical simulation; Plastic bearing method;
D O I：
10.13545/j.cnki.jmse.2019.01.010
中图分类号：
学科分类号：
摘要：
Aiming at the problem that the blasting-roof thickness was highly depended by experiences in deep hole mining, the plastic bearing method was used for calculating the external work and internal work of blasting-roof under the limit failure state. Based on the virtual work principle, the limit bearing equation of blasting-roof under typical five boundary conditions were derived. By using the Surpac-Flac3D numerical modeling, the equivalent blast load calculation and the custom programming, a numerical simulation technique for obtaining dynamic response characteristics of blasting-roof was proposed. Accordingly, an integrate method for determining blasting-roof thickness was proposed. Taking a VCR test stope as the application case, the minimum blasting-roof thickness was calculated as 4.7m using the derived equation. Based on that, the numerical simulations under different blasting-roof thickness condition were carried out. Through analysis of stress distribution, plastic zone evolution and safety factor calculation, the safe blasting-roof thickness was comprehensively determined as 7m. The research provides an feasible tool for determining the blasting-roof thickness in deep hole mining. © 2019, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：65 / 71
页数：6
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