摘要
随着大直径深孔采矿法的推广应用,采空区顶板暴露面积进一步扩大,空区失稳坍塌问题凸显,为了能够及时掌握采空区稳定状态,加强采空区管理,避免采空区坍塌引发矿山重大安全事故,开展开采过程中的采空区稳定性分析十分必要。本文在总结目前国内外常用的采空区稳定性分析方法的基础上,采用目前较为先进的BLSS-PE矿用三维激光扫描系统辅助开展采空区探测,建立了某矿山主生产中段的采空区数值计算模型,通过模拟采场回采过程,分析不同回采阶段的应力与位移分布云图,得出二步采场回采对一步采空区稳定状态的影响大小。结果表明,该矿山二步采场回采使得一步采空区周围的应力集中范围进一步扩大,并与一步采空区形成了应力叠加,特别是在矿柱位置出现了应力集中,其最大集中应力约为26 MPa,且垂直方向上的位移量增加,最大位移量接近5 mm,存在顶板垮塌风险。
With the application of large diameter deep hole mining method,the exposed area of gob roof is further expanded,and the problem of cavitation instability is highlighted.In order to master the stable state of goaf in time,we need strengthen goaf management to avoid major safety accidents in mines caused by the collapse of goaf,therefore,it is necessary to carry out goaf stability analysis during mining.In this paper,on the basis of summarizing the commonly used goaf stability analysis methods at home and abroad,the numerical calculation model of goaf is established with the advanced BLSS-PE mine 3D laser scanning system,through the simulation of stopping process,the stress and displacement distribution cloud map of different stope stages are analyzed,the influence of two-step stope recovery on the stability of one-step goaf is obtained,the results show that the stress concentration range around the one-step goaf is further enlarged and stress superposition is formed by two-step stope recovery,in particular,stress concentration appears at the pillar position,the maximum stress concentration is about 26 MPa,and the vertical displacement increases,the maximum displacement is close to 5 mm,there is a risk of roof collapse.
作者
张驰
冀虎
陈凯
张达
李建
ZHANG Chi;JI Hu;CHEN Kai;ZHANG Da;LI Jian(BGRIMM Technology Group,Beijing 100160,China;Beijing Key Laboratory of Nonferrous Intelligent Mining Technology,Beijing 102628,China;Masteel Luohe Mine Co.,Ltd.,Hefei 231500,China)
出处
《中国矿业》
2021年第3期181-187,共7页
China Mining Magazine
基金
“十三五”国家重点研发计划项目资助(编号:2017YFC0602904,2017YFC0804606)。
