露天矿裂隙岩体边坡离散单元法模拟分析
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摘要
离散单元法能够分析节理裂隙岩体沿离散界面产生滑移、张裂、垮落等大变形问题,是岩石开挖工程中分析非连续介质问题的重要方法。徐东沟露天矿最终境界边坡上下部均由坚硬块状结构岩体组成,而边坡中部则为岩性较软的绿泥石英片岩构成,且为典型的顺坡向层状结构,分析表明,绿泥石英片岩构成的局部边坡区域位移较大,模拟开采至最终-348m水平时,水平位移最大达1.6m,垂直向下位移达1.4m,应用强度折减法得到边坡安全系数仅为1.05,开采出露后极有可能产生边坡失稳,影响矿山的安全生产。
The discrete element method can analyze the large deformation problems of joint fracture rock mass along the discrete interface such as sliding,tensile crack and caving,which is an important method to analyze discontinuous medium problems in rock excavation engineering.Xudonggou mine slope top and bottom are composed of rigid block structure of rock mass,center for lithology and slope of soft chlorite quartz schist,and layered structurefor the typical slope.Analysis showed that the chlorite quartz schist in the composition of local displacement of slope area was larger,at the condition of simulation mining to end-348 mlevel mining depth,the biggest horizontal displacement was 1.6 m,vertical downward displacement reached 1.4 m,the slope safety factor was only 1.05 by application strength subtraction.Therefore,after mining,it is very likely to cause slope instability and affect the safe production of the mine.
The discrete element method can analyze the large deformation problems of joint fracture rock mass along the discrete interface such as sliding,tensile crack and caving,which is an important method to analyze discontinuous medium problems in rock excavation engineering.Xudonggou mine slope top and bottom are composed of rigid block structure of rock mass,center for lithology and slope of soft chlorite quartz schist,and layered structurefor the typical slope.Analysis showed that the chlorite quartz schist in the composition of local displacement of slope area was larger,at the condition of simulation mining to end-348 mlevel mining depth,the biggest horizontal displacement was 1.6 m,vertical downward displacement reached 1.4 m,the slope safety factor was only 1.05 by application strength subtraction.Therefore,after mining,it is very likely to cause slope instability and affect the safe production of the mine.
引文
[1]张亚宾,甘德清,陈超.边坡在二次卸荷过程中的应力变化规律研究[J].金属矿山,2010(12):22-26.
[2]刘佳,陈忠辉,姬东晓,等.露天矿高边坡破坏机理研究的强度折减法[J].金属矿山,2018(9):74-78.
[3]关晓锋,王天璐.开挖影响下的岩质高陡边坡稳定性研究[J].现代矿业,2017,33(12):163-167.
[4]程玉梅.基于离散元强度折减法的高陡顺层岩质边坡稳定性分析[M].北京:中国地质大学(北京),2017.
[5]王勇,胡勇,范卫琴.基于离散单元法的裂隙岩体渗流应力耦合分析[J].水文地质工程地质,2009(1):44-47.
[2]刘佳,陈忠辉,姬东晓,等.露天矿高边坡破坏机理研究的强度折减法[J].金属矿山,2018(9):74-78.
[3]关晓锋,王天璐.开挖影响下的岩质高陡边坡稳定性研究[J].现代矿业,2017,33(12):163-167.
[4]程玉梅.基于离散元强度折减法的高陡顺层岩质边坡稳定性分析[M].北京:中国地质大学(北京),2017.
[5]王勇,胡勇,范卫琴.基于离散单元法的裂隙岩体渗流应力耦合分析[J].水文地质工程地质,2009(1):44-47.