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金属矿山 ›› 2016, Vol. 45 ›› Issue (10): 11-14.

• 采矿工程 • 上一篇    下一篇

胶结充填体对二步矿体作用机理分析

郑明强1,2,付厚利3,秦哲4,冯佰研1,2   

  1. 1.山东科技大学土木工程与建筑学院,山东 青岛 266590;2.山东省防灾减灾重点实验室,山东 青岛 266590;3.临沂大学建筑学院,山东 临沂 276000;4.山东科技大学矿业与安全工程学院,山东 青岛 266590
  • 出版日期:2016-10-15 发布日期:2016-11-04

Mechanism of Cemented Tailings Backfill Acting on the Second-Step Ore Body

Zheng Mingqiang1,2,Fu Houli3,Qin Zhe4,Feng Baiyan1,2   

  1. 1.College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;2.Shandong Province Key Laboratory of Disaster Prevention and Mitigation,Qingdao 266590,China;3.School of Architecture,Linyi University,Linyi 276000,China;4.School of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao 266590,China
  • Online:2016-10-15 Published:2016-11-04

摘要: 为研究胶结充填体对二步矿体的作用机理,以新城金矿782、792和802 3个一步采场为研究对象,运用FLAC3D数值模拟软件,对一步采场从第3分段开挖充填到第5分段开挖充填中胶结充填体的作用机理进行模拟研究。结果表明:从一步采场第3分段到第5分段开挖充填,二步矿体内的应力值比胶结充填体内的应力值大5~6倍。792采场胶结充填体与二步矿体接触面上产生的塑性区以受拉破坏为主,782、802采场胶结充填体与二步矿体接触面上的塑性区由剪切破坏产生,深度基本保持在1 m左右。一步采场回采至11分层后,顶板沉降量加快,需对顶板进行支护处理,以保证回采安全。

关键词: 胶结充填体, 二步矿体, 作用机理, 数值模拟

Abstract: In order to study the mechanism of cemented backfill acting on the second-step ore body,and taking 782,792,and 802 three one-step stopes of the Xincheng Gold Mine as research object,the FLAC3D simulation software was applied to make simulation on the mechanism of cemented backfill from the third segment to the fifth segment for the excavation and backfilling.The project result indicates:The stress of second-step ore body is 5~6 times as big as that of cemented backfill during excavation and backfilling from the third segment to the fifth segment of first-step stope.Tensile failure was produced in plastic zone of contact surface of cemented backfill and second-step ore body in the 792 stope,and shear failure was produced in plastic zone of contact surface of cemented backfill and second-step ore body in the 782 and 802 stopes,and their depth remained at around 1m.After one-step mining was excavated at layer 11,the subsidence of roof increased quickly,so roof should be supported to ensure mining safety.

Key words: Cemented backfill, Two-step ore body, Mechanism, Numerical simulation