露井联采合理边坡保护煤柱宽度确定

Reasonable slope protecting coal pillar width under open-pit and underground combined mining

针对近水平赋存煤层,分析露井联采技术适用条件,总结露井联采下边坡的变形破坏机理。根据我国内蒙古某露天矿的物理力学参数建立数值模型,利用UDEC2D软件模拟不同边坡保护煤柱宽度开采方案,通过理论分析和数值计算确定工作面覆岩移动规律,对比分析各方案从而优化保护煤柱宽度参数,综合考虑边坡稳定性及资源开发利用率,最终确定合理边坡保护煤柱宽度为100 m,为类似露天矿山开采提供理论依据。

According to nearly horizontal occurrence coal seam,the article analyzed the applicable conditions of open-pit and underground combined mining, and summarized slope deformation failure mechanism under open-pit and underground combined mining. The numerical model is established based on physical and mechanical parameters in Inner Mongolia open-pit mine. Mining plans of different slope protecting coal pillar width are simulated by UDEC2D. Movement rule of overlying strata is determined through theoretical analysis and numerical calculation. The schemes are compared and analyzed to optimize parameters of protecting coal pillar width. Slope stability and resources development and utilization ratio are comprehensively considered to ultimately determine that the reasonable slope protecting coal pillar width is 100 m, which provides theoretical basis for similar open-pit mine mining.