近距离煤层条采工作面开采设计研究

Mining Design of Partial Extraction Working Face with Close-distance Seam

对于近距离煤层同时开采两层煤,煤柱的设置关系到煤层压力的稳定。某矿由于煤层距离较近(9m),根据之前煤柱宽度及回采宽度的论证,采取采40m留设30m煤柱的方案。文中结合数值模拟,对该方案的开采关键参数进行了校核,使下层煤条带开采时煤柱塑性区宽度、煤柱垂直应力分布、地表变形均在要求的范围内,为其他同类采区开采设计提供借鉴。

The coal pillar design is relevant to the stability of seam pressure in extracting two levels of coal simul taneously in close--distance seam. According to the demonstration of the original pillar and mining width in the 9--meter--distance coal seam, the paper introduces the mining design of ＂extracting 40 meters and setting 30-- meter pillar＂, whose key mining parameters have been verified by numerical simulation with the plastic zone width of pillar, vertical stress distribution of pillar and surface deformation in standard requirements.