柿竹园多金属矿露天-地下协同开采安全稳定性分析  

Analysis on Safety and Stability of Open-Pit and Underground Collaborative Mining in Shizhuyuan Polymetallic Mine

作　　者：何斌全 李仲泽 陈国辉[1] 陈功 刘奇 雷成 HE Binquan;LI Zhongze;CHEN Guohui;CHEN Gong;LIU Qi;LEI Cheng(Hunan Shizhuyuan Nonferrous Metals Co.,Ltd.,Chenzhou,Hunan 423037,China;Changsha Institute of Mining Research Co.,Ltd.,Changsha,Hunan 410012,China)

机构地区：[1]湖南柿竹园有色金属有限责任公司,湖南郴州市423037 [2]长沙矿山研究院有限责任公司,湖南长沙410012

出　　处：《矿业研究与开发》2023年第4期1-10,共10页Mining Research and Development

摘　　要：为研究柿竹园多金属矿露天-地下同时开采的相互影响,根据矿山的实际生产情况,构建了矿山的地表模型、露天坑最终境界模型、矿体模型、塌陷区及采空区模型。为尽可能真实地反映矿山开采及覆岩的变形特征,按不同的回采高度和回采区域将矿山整体开采顺序从上到下划分为6个阶段。其中,第1至第5阶段为露天-地下联合开采,露天开采东、北部684 m以上以及西、南部612 m以上的矿体,与此同时,地下采用分段凿岩阶段空场法开采东部407~610 m、北部470~536 m的矿体,以无底柱分段崩落法回采西部530~610 m的矿体以及中部490 m以上的矿体;第6阶段为地下开采结束全部转为露天开采。通过数值模型得出了露天-地下协同开采期间,各开采阶段地表和采场产生的最大位移量、采场顶板产生的最大拉应力值以及最大压应力的位置和大小;并对露天开采时,井下采场、采空区顶板、边坡的位移和应力进行了监测和分析。结果表明,露天-地下协同开采期间,露天开采区形成的露天边坡和平台未出现明显的应力集中现象,露天边坡产生的位移、拉应力和剪应力值均较小,矿山露天及地下开采对最终边坡稳定性造成的影响较小,开采造成的位移和应力集中程度不会对露天边坡安全稳定性构成威胁。In order to study the interaction of simultaneous open-pit and underground mining in Shizhuyuan Polymetallic Mine,according to the actual production situation of the mine,the surface model,the final boundary model of the open pit,the ore body model,the collapse area and the goaf models of the mine were constructed to truly reflect the deformation characteristics of mining and overburden rock as much as possible.The overall mining sequence of the mine was divided into six stages from top to bottom according to different mining heights and mining areas.Among them,the first to fifth stages were combined open-pit and underground mining,open-pit mining of ore bodies above 684 m in the east and the north,and mining of ore bodies above 612 m in the west and south.At the same time,open stoping method of sub drilling stage was used to mine the ore bodies of 407-610 m in the east and 470-536 m in the north,and sublevel caving method was used to mine the ore bodies of 530-610 m in the west and 490 m in the middle.At the end of the sixth stage,all underground mining will be converted to open-pit mining.Through the numerical model,the maximum displacement of surface and stope,the maximum tensile stress of stope roof,as well as the location and magnitude of maximum compressive stress in each mining stage were obtained.The displacement and stress of underground stope,goaf roof and slope during open-pit mining were monitored and analyzed.The results show that during the open-pit and underground collaborative mining,there is no obvious stress concentration on the open-pit slope and platform formed in the open-pit mining area,and the displacement,tensile stress and shear stress values of the open-pit slope are small.The open-pit and underground mining of the mine have little impact on the final slope stability,and the displacement and stress concentration caused by mining will not pose a threat to the safety and stability of the open-pit slope.

关 键 词：露天-地下协同开采 位移 应力 边坡稳定性 数值模拟 

分 类 号：TD853[矿业工程—金属矿开采]