摘要
程潮铁矿进入围岩性质复杂多变的深部开采环境,塌陷坑移动变化规律与浅部不尽相同,以致无法准确预测周边地表重要建筑物的稳定性。为保证新副井和塌陷区周边地表重要构筑物安全,基于室内相似模拟试验和数值模拟方法,对-500 m以下深部开采塌陷坑移动规律进行了研究,分析了塌陷坑移动角和远近地表围岩随开采深度的变化规律。研究表明:(1)-500 m以下矿体崩落开采造成的地表塌陷变形逐步往上盘转移,上盘移动角呈现增大趋势,地表移动范围未超出初期设计值;(2)开采初期下盘所受影响较大,随着开采推进,影响逐步减弱;(3)整个开采阶段,远近地表区域围岩应变表现出不同的变化规律;(4)至开采结束,地表新副井区域倾斜值达到0.017mm/m,超出临界影响标准值,表明开采会对新副井带来一定程度的影响。依据不同开采阶段对新副井的影响程度,提出了新副井稳定性控制措施,研究结果对于程潮铁矿深部安全开采工程有一定的指导意义。
Chengchao Iron Mine enters the deep mining environment with complex and changeable surrounding rock properties,and the movement and change patterns of the collapse pits are different from those in the shallow ones,so that,it is impossible to accurately predict the stability of important surrounding structures on the ground.In order to ensure the safety of the new auxiliary shaft and the important surface structures around the subsidence area,based on the indoor similar simulation test and numerical simulation method,the movement regularity of the collapse pit in the deep mining below-500 m is studied,and the variation regularity of the movement angle of collapse pit and the surrounding rock of far and near surface with mining depth is analyzed.The study results show that:(1) the surface collapse and deformation caused by the mining of ore bodies below-500 m gradually transfer to the hanging wall,the moving angle of the hanging wall shows an increasing trend,and the range of surface movement does not exceed the initial design value;(2)In the early stage of mining,the bottom plate was greatly affected,and as the mining progressed,the impact gradually weakened;(3) Throughout the mining stage,the surrounding rock strains in the near and far surface regions show different patterns of change;(4)At the end of mining,the inclination value of the new auxiliary well on the surface reached 0.017 mm/m,exceeding the critical impact standard value,indicating that mining will have a certain degree of impact on the new auxiliary well.According to the degree of influence of different mining stages on the new auxiliary shaft,the stability control measures of the new auxiliary shaft are proposed. The study results have certain guiding significance for the deep safety mining project of Chengchao Iron Mine.
作者
许梦国
张威威
王平
程爱平
胡彦
胡倡瑞
XU Mengguo;ZHANG Weiwei;WANG Ping;CHENG Aiping;HU Yan;HU Changrui(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallogenic Mineral Resources,Wuhan 430081,China)
出处
《金属矿山》
CAS
北大核心
2021年第9期1-7,共7页
Metal Mine
基金
国家自然科学基金项目(编号:51604195)
湖北省自然科学基金项目(编号:2018CFC818)。
关键词
深部开采
崩落法开采
移动角
地表稳定性
相似模拟
数值模拟
deep mining
caving mining
moving angle
surface stability
similar simulation
numerical simulation
