深孔落矿破顶层厚度综合确定方法及应用  

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

作　　者：汪伟 罗周全[2] 秦亚光[2] 向军[3] WANG Wei;LUO Zhouquan;QIN Yaguang;XIANG Jun(Jiangxi Copper Technology Research Institute Company,Nanchang,Jiangxi 330096,China;School of Resources and Safety Engineering,Central South University,Changsha,Hunan 410083,China;FankouLead-Zinc Mine,Shaoguan,Guangdong 512325,China)

机构地区：[1]江西铜业技术研究院有限公司,江西南昌330096 [2]中南大学资源与安全工程学院,湖南长沙410083 [3]凡口铅锌矿,广东韶关512325

出　　处：《采矿与安全工程学报》2019年第1期65-71,共7页Journal of Mining & Safety Engineering

基　　金：国家"十三五"重点研发计划课题项目(2017YFC0602901);国家自然科学基金项目(51274250);中南大学中央高校基本科研业务费专项资金项目(2016zzts091)

摘　　要：针对深孔落矿破顶层厚度依赖经验判定的问题,运用塑性极限分析法计算破顶层临界破坏时所受外力功和内力功,基于虚功原理,推导得到5种典型边界条件下破顶层极限承载表达式。通过Surpac-Flac3D数值转换建模、爆破载荷等效、自定义编程等操作,建立获取破顶层动力响应特征的数值模拟技术。由此,提出基于力学计算与数值模拟分析的破顶层厚度综合确定方法。以某矿VCR法试验采场为应用对象,通过推导的极限承载表达式确定其最小破顶厚度为4.7 m,据此开展不同破顶厚度工况的数值模拟,结合应力分布特征、塑性区演化状态及安全率计算等分析,综合确定采场安全破顶厚度为7 m。研究为深孔落矿破顶层厚度的确定提供了客观可行的手段。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-Flac3 D 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 4.7 m 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 7 m. The research provides an feasible tool for determining the blasting-roof thickness in deep hole mining.

关 键 词：深孔落矿 破顶层 塑性极限法 动力数值模拟 

分 类 号：TD23[矿业工程—矿井建设]