大跨度破碎顶板支护方案数值模拟分析及工程应用

Numerical simulation analysis and engineering application of large-span broken roof support scheme

为了解决金厂河多金属矿大跨度连续破碎顶板的支护技术难题,开展了矿区岩石力学试验和工程地质调查,获得了大直径深孔采场顶板的岩体质量分级。通过建立矿山典型开采区域的三维数值模型,开展了三种支护方案的数值模拟分析,确定了切顶硐室的“护顶矿壁+点柱”顶部结构布置形式和锚索—锚杆联合支护方案。结合现场应用表明,顶板区域支护后应力值比未支护时降低61.6%,顶板位移量降低了59.4%,大幅度提高了破碎顶板的安全性,保障了矿山安全高效回采,可为类似矿山采场顶板支护方案设计提供指导。

To solve the technical problem of long-span continuous broken roof support in the Jinchanghe polymetallic mine,the rock mechanics test and engineering geological survey were carried out,and the rock mass quality classification of large-diameter long-hole stope was obtained.Based on the construction of the three-dimensional numerical model of a typical mining area,the numerical simulation analysis of three support schemes was carried out,and the top structure layout of the"roof support wall+point column"of the roof cutting chamber and the combined support scheme of anchor cable and anchor bolt were determined.Combined with the field application,the stress value of the roof area after support was reduced by 61.6%,and the displacement of the roof was reduced by 59.4%,which greatly improved the safety of the broken roof and ensures the safe and efficient mining of the mine.The multi-scale coordinated control technology of anchor cable and bolt could greatly improve the safety of the broken roof and ensured safe and efficient mining of mines.The research results could provide guidance for the optimal design of roof support schemes in similar mines.