深凹高边坡急倾斜挂帮矿开采数值模拟分析

Numerical Simulation and Analysis on Mining of Steeply Inclined Hanging Wall Ore in Deep and High Slope

采用FLAC3D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。

FLAC3D 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.