龙桥铁矿复杂采空区的探测及处理方案
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摘要
安徽省庐江县龙桥铁矿-320 m水平采空区,发生局部塌落导致现有采空区形态不详,为保证下部矿体正常安全开采,在地表不允许塌落的情况下,采用留设隔离矿柱的方案来隔离上部采空区.在钻孔探测确定采空区形态的基础上,应用FLAC3D程序建立三维数字模型,分析了留设不同厚度隔离层对整个采空区应力分布的影响及自身稳定程度.结果表明:留设25 m厚的水平隔离矿柱可以有效地分担地压分布情况,能够保证下部矿体安全开采.
Local goaf collapse at-320 m level in Longqiao Iron Mine has caused the unknown goaf shape.Under the condition of unpermitted surface subsidence,in order to ensure the deep ore bodies safety,the interval layer should be remained.Based on the drilling detection,the goaf shape was definitely known,and then the FLAC3D was applied to analyzing the influence of stress distribution in the whole goaf under the conditions of different interval layer thickness.The results showed that the 25 m interval layer remained in next level can effectively alleviate stress distribution.It can also ensure the mining safety at the next level.
Local goaf collapse at-320 m level in Longqiao Iron Mine has caused the unknown goaf shape.Under the condition of unpermitted surface subsidence,in order to ensure the deep ore bodies safety,the interval layer should be remained.Based on the drilling detection,the goaf shape was definitely known,and then the FLAC3D was applied to analyzing the influence of stress distribution in the whole goaf under the conditions of different interval layer thickness.The results showed that the 25 m interval layer remained in next level can effectively alleviate stress distribution.It can also ensure the mining safety at the next level.
引文
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[2]谭志祥,刘光庆,张孟凯,等.采动区建筑物移动变形规律实测研究[J].中国安全科学学报,2007,17(2):44-49.(Tan Zhi-xiang,Liu Guang-qing,Zhang Meng-kai,et al.Study on the movement and deformation law of buildings inmining area by observation[J].China Safety Science Journal,2007,17(2):44-49.)
[3]李纯青,姚香.采空区处理新技术的理论研究及应用实践[J].黄金,2004,25(3):22-27.(Li Chun-qing,Yao Xiang.The theoretical study andapplication of a new technique for the treatment of mined-outarea[J].Gold,2004,25(3):22-27.)
[4]Schaubs P M,Ord A,German G H.Scenario testing of fluid-flow and deformation during mineralization:from simple tocomplex geometries FLAC and numerical modeling inaeromechanics[M].Rotterdam:Balkema,2003:63-70.
[5]Fang Z,Harrison J P.Development of a local degradationapproach to the modeling of brittle fracture in heterogeneousrocks[J].International Journal of Rock Mechanics andMining Sciences,2002,39(4):443-457.
[6]朱维申,李晓静,郭彦双,等.地下大型洞室群稳定性的系统性研究[J].岩石力学与工程学报,2004,23(10):1689-1693.(Zhu Wei-shen,Li Xiao-jing,Guo Yan-shuang,et al.Systematical study on stability of large underground houses[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(10):1689-1693.)
[7]刘春玲,祁生文,童立强,等.利用FLAC3D分析某边坡地震的稳定性[J].岩石力学与工程学报,2004,23(16):115-120.(Liu Chun-ling,Qi Sheng-wen,Tong Li-qiang,et al.Stability analysis of slope under earthquake with FLAC3D[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(16):2730-2733.)
[8]Itasca Consulting Group Inc.FLAC basics 1999[M].Minneapolis:Itasca Consulting Group Inc,1999.
[9]Itasca Consulting Group Inc.User’s guide 1999[M].Minneapolis:Itasca Consulting Group Inc,1999.
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