北洺河铁矿开采深度与地表岩移时空演变规律研究  

Study on Temporal and Spatial Evolution of Mining Depth and Surface Rock Movement in Beiminghe Iron Mine

作　　者：邹开华 任凤玉[1] 丁航行[1] 张晶 李广辉 ZOU Kaihua;REN Fengyu;DING Hangxing;ZHANG Jing;LI Guanghui(School of Resources and Civil Engineering,Northeastern University,Shenyang,Liaoning 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《矿业研究与开发》2022年第8期60-65,共6页Mining Research and Development

基　　金：“十三五”国家重点研发计划项目(2016YFC0801601);国家自然科学基金重点项目(51534003)。

摘　　要：北洺河铁矿因地下开采引起地表发生大规模塌陷,且随着开采深度不断下移,地表塌陷范围逐步扩大,严重威胁地表构筑物及南侧北洺河河道的安全。为保障地下开采的安全及地表岩移的有效控制,基于矿山各生产水平平面图矿岩分布,利用三维建模软件Rhino建立符合矿山实际的精细数值模型,然后将该模型导入FLAC^(3D)中在自重应力和采动应力作用下进行有限差分计算。通过模拟矿体的逐次开采,研究开采深度与地表岩移的时空演变规律,预测不同开采深度对应的地表岩移范围,并通过对比北洺河铁矿地表岩移现状,确定深部开采引起的地表岩移范围。结果显示,随开采深度的增加,地表岩移可分为续平稳、缓慢增加与显著增加3个阶段;当开采至-140 m水平时,地表发生塌陷的可能性较大;开采至-230 m水平时,地表岩移范围已基本到达北洺河河道北岸,对河道的影响颇大,现阶段宜采取一定的地表岩移控制措施以保障河道的安全。The Large scale surface collapse occurred in Beiminghe Iron Mine due to the underground mining.With the continuous deepening of mining depth,the scope of surface collapse gradually expanded,which seriously threatened the safety of surface structures and Beiming River in the south of the mine.In order to ensure the safety of underground mining and the effective control of surface rock movement,based on the ore rock distribution in the plan of each production level of the mine,a refined numerical model in line with the actual situation of the mine was established by using the 3D modeling software Rhino.Then the model was imported into FLACfor finite difference calculation under the action of self-weight stress and mining stress.The temporal and spatial evolution of mining depth and surface rock movement was studied by simulating the successive mining of ore body,and the surface rock movement ranges corresponding to different mining depths were predicted.Comparing the current situation of surface rock movement in Beiminghe Iron Mine,the range of surface rock movement caused by deep mining was determined.The results show that with the increase of mining depth,the surface rock movement can be divided into three stages,including continuous stable,slow increase and significant increase.As mining to-140 m level,the possibility of surface collapse is greater.When the mining reaches the-230 m level,the surface rock movement range reaches the north bank of Beiming River,which has a great impact on the river.At this stage,a certain control measures of surface rock movement should be taken to ensure the safety of the river.

关 键 词：地下开采 地表岩移 精细建模 采动应力 时空演变 

分 类 号：TD325[矿业工程—矿井建设]