深部矿床上行式开采采场参数优化数值模拟

环境复杂“三下”矿床开采引发的岩层变形威胁到地表建构筑物的安全。以典型的“三下”矿山金口岭深部矿体开采为例，采用定量与定性相结合的方式，对金口岭深部矿体上行式开采25组不同采场结构参数下地表变形特性进行了数值模拟。结果表明，上行式盘区点柱式上向分层充填采矿法对保护地表建构筑物安全极为有利，当采用盘区长度为70 m、顶柱厚度为6 m、间柱宽度为6 m、点柱尺寸为4 m×4 m、点柱间距为12 m的结构参数时，地表倾斜值为-0.18 mm/m，曲率值为-0.003×10^-3/m，水平变形值为0.11 mm/m，参照《GB 50771-2012，有色金属采矿设计规范》，均小于地表建构筑物所允许的变形值。

Numerical Simulation on Stope Parameter Optimization of Upward Mining in Deep Mine

The rock deformation caused by “three-under” mining under complex environment threatens the safety of ground structures.Taking a typical “three-under” mine of Jin Kouling as an example,the numerical simulation on surface deformation characteristics for 25 groups of upward mining plans under different stope parameters are conducted with numerical simulation method in the combination of quantitative and qualitative method.The results show that the upward stoping-filling method with pointed pillars poses a great advantage in protecting surface structures.The surface tilt value is -0.18 mm/m,curvature is -0.003×10^-3/m and horizontal deformation value is 0.11 mm/m,which is less than the allowed by reference to the Code for Design of Nonferrous Metal Mining(GB50771-2012) when the stope parameters are chosen as panel length of 70 m,the thickness of top pillar 6 m,width of rib pillar 6 m,size of pointed pillars 4 m×4 m,and the distance of pointed pillars at 12 m.