深凹高边坡急倾斜挂帮矿开采数值模拟分析
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摘要
采用FLAC~(3D)数值模拟分析白云鄂博东矿挂帮矿开采对边坡岩体破坏、应力分布及位移特征的影响。结果表明:当首采位置L>18m时,采空区前缘围岩塑性宽度不受其影响;挂帮矿的开采使边坡岩体应力向空区两侧移动而形成应力集中,采空区上部台阶岩体拉应力区呈"上向延伸"状态;挂帮矿的开采引起最大水平位移点上升至空区顶板水平,在一定条件下,边坡水平位移区形成"扩展"和"收缩"两种运动方式。当L>18m时,边坡水平位移区不受首采位置的影响。
FLAC~(3D) numerical simulation was used to analyze the influence of mining hanging wall ore on rock mass failure,stress distribution and displacement characteristics of slope in the east of Baiyun Ebo Iron Mine.The results were concluded as follows.Firstly,the plastic width of surrounding rock in the front of goaf was not affected when the length of first mining position was larger than 18 m.Secondly,the mining of hanging wall ore caused that the stress of slope rock mass moved to both sides of goaf,so as to form stress concentration,and the tensile stress area of the upper step rock mass of the goaf was in a state of upward extension.Thirdly,the mining of hanging wall ore caused the maximum horizontal displacement point to rise to the roof level of goaf.And under certain conditions,two motion modes of expansion and contraction were formed in the horizontal displacement zone of slope.When the length was larger than 18 m,the horizontal displacement area of slope would not be affected by the first mining position.
FLAC~(3D) numerical simulation was used to analyze the influence of mining hanging wall ore on rock mass failure,stress distribution and displacement characteristics of slope in the east of Baiyun Ebo Iron Mine.The results were concluded as follows.Firstly,the plastic width of surrounding rock in the front of goaf was not affected when the length of first mining position was larger than 18 m.Secondly,the mining of hanging wall ore caused that the stress of slope rock mass moved to both sides of goaf,so as to form stress concentration,and the tensile stress area of the upper step rock mass of the goaf was in a state of upward extension.Thirdly,the mining of hanging wall ore caused the maximum horizontal displacement point to rise to the roof level of goaf.And under certain conditions,two motion modes of expansion and contraction were formed in the horizontal displacement zone of slope.When the length was larger than 18 m,the horizontal displacement area of slope would not be affected by the first mining position.
引文
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[19]徐嘉谟.露天开采与地下开采引起岩石移动的一些主要区别[J].岩石力学与工程学报,1990,9(4):311-318.
[20]张志.平庄西露天矿露井协调开采控制技术研究[D].阜新:辽宁工程技术大学,2010.
[21]袁永才.露井联采边坡稳定性与加固监测研究[D].青岛:青岛理工大学,2013.
[2]孙世国,郭炜晨,刘文波,等.露天转地下开采诱发高边坡滑移机制研究[J].金属矿山,2015(5):162-165.
[3]王宾,宋卫东,杜建华.深凹露天转地下开采地压宏观调查及巷道变形规律分析[J].金属矿山,2009(5):27-32.
[4]李博,杨志强,高谦.深凹露天转地下开采对高陡边坡稳定性影响数值分析[J].矿业研究与开发,2015,35(2):65-68.
[5]宋朝阳,马庆福,纪洪广,兰舟,王大润.露天转地下挂帮矿开采边坡稳定性及失稳模式研究[J].金属矿山,2017(9):1-8.
[6]吴姗,宋卫东,杜建华,张兴才,周家祥.高陡边坡下充填法开采挂帮矿稳定性数值模拟与安全监测[J].采矿与安全工程学报,2013,30(6):874-879.
[7]程文文,宋卫东,张兴才,等.高陡边坡下开采挂帮矿对滑体稳定性的影响[J].煤炭学报,2011,36(3):377-382.
[8]江兵,吴姗.大冶铁矿挂帮矿开采方法及对滑体稳定性的影响[J].金属矿山,2011(10):48-50.
[9]蔡路军,马建军,江兵,等.高陡边坡下采矿安全问题分析探讨[J].矿业快报,2006,25(3):33-35.
[10]宋卫东,杜建华,杨幸才,等.深凹露天转地下开采高陡边坡变形与破坏规律[J].北京科技大学学报,2010,32(2):145-148.
[11]刘艳章,张群,叶义成,任贤锋,王其虎,孙永久.挂帮矿开采低段高无底柱留矿嗣后充填采矿法[J].金属矿山,2014(12):40-44.
[12]王平,张开新,徐钊.挂帮矿开采的相似模拟试验与安全性分析[J].金属矿山,2015(6):14-18.
[13]黄萍,杨鹏,崔明,梁乃跃.基于FLAC3D稳定性分析的仓上金矿挂帮矿开采[J].金属矿山,2012(4):16-18.
[14]李闻杰,严国栋,张振芳,杨久林,苑世林,康志强.露天转地下矿山边坡挂帮矿开采数值模拟研究[J].中国矿山工程,2011,40(2):29-32.
[15]康志强,李富平,李闻杰,南世卿.挂帮矿开采引起的残采边坡位移场分布规律[J].金属矿山,2009(12):50-52.
[16]李辉,邓建辉.滑坡体下挂帮矿开采方案与分析[J].岩石力学与工程学报,2006,25(5):985-990.
[17]周志刚,郝全明,牟英杰.无底柱分段崩落法在白云鄂博铁矿东矿的应用[J].现代矿业,2015,31(11):31-33.
[18]李默然.基于FLAC3D的白云鄂博铁矿东矿边坡稳定性研究[D].包头:内蒙古科技大学,2011.
[19]徐嘉谟.露天开采与地下开采引起岩石移动的一些主要区别[J].岩石力学与工程学报,1990,9(4):311-318.
[20]张志.平庄西露天矿露井协调开采控制技术研究[D].阜新:辽宁工程技术大学,2010.
[21]袁永才.露井联采边坡稳定性与加固监测研究[D].青岛:青岛理工大学,2013.