二步骤回采采场顶板拱架模型及充填接顶率优化  

Arch model of roof and optimization of roof-contacted filling rate in two-step mining

作　　者：陶明[1] 赵岩 过江[1] Ming TAO;Yan ZHAO;Jiang GUO(School of Resources and Safety Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源与安全工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第6期1893-1905,共13页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12072376,52174140);the Fundamental Research Funds for Central Universities of the Central South University,China(No.2020zzts195)。

摘　　要：为了探究深部矿山采空区内充填体的合理接顶率,以二步骤回采矿山为例,应用三铰拱力学模型推导回采过程中具有不同接顶率的采空区顶板的应力表达式,并结合数值模拟分析接顶率对采场顶板应力状态的影响。结果表明,竖向应力影响矿房和矿柱采场顶板的应力状态,而水平应力主要影响矿房采场顶板的应力状态。矿房采场充填接顶率对矿柱采场顶板自稳平衡拱的形成有较大的影响。在冬瓜山铜矿开采过程中,现场实际充填接顶率约为80%,实现了矿产资源安全、稳定的连续回采。To investigate the reasonable roof-contacted filling rate(RCFR)of the backfill in the goaf of a deep mine,the three-hinged arch mechanics model was applied to the two-step mine,and the stress expressions of the goaf roof with different roof-contacted filling rates were derived.Then,the influence of RCFR on the stress state of the roof was analyzed combined with numerical simulation.The results indicated that vertical stress changed the stress state of the roof in the room-stopes and pillar-stopes,while horizontal stress mainly affected the stress state of the roof in the room-stopes.The RCFR in the room-stopes had a greater influence on the formation of the self-stable arch of the roof in pillar-stopes.During the mining process of the Dongguashan Copper Mine,the actual RCFR at the site was about 80%,which achieved a safe and stable uninterrupted recovery of mineral resources.

关 键 词：拱形力学模型 充填接顶率 顶板稳定性 数值模拟 二步骤回采 

分 类 号：TD853[矿业工程—金属矿开采]