倾斜煤层沿空掘巷窄煤柱稳定与宽度优化研究

Study on Stability and Width Optimization of Narrow Coal Pillars Along Gob of Fully Mechanized Caving Face in Inclined Coal Seam

为研究倾斜煤层综放沿空掘巷窄煤柱的稳定与宽度优化设计,基于沿空掘巷护巷煤柱周围矿山压力分析和煤柱合理留设宽度经验公式计算结果(5.61~12.46 m),采用FLAC3D模拟软件,在无支护条件下对6、8、10、12 m这4种煤柱宽度间的应力场、位移场和塑性区分布进行数值分析比较。结果表明,最优护巷煤柱宽度为8.0 m。因此,在确定最优护巷煤柱宽度基础之上,通过FLAC3D对2种支护参数进行数值分析和比较优化,确定了2214回风巷最优支护参数设计,即高强让压锚索锚喷联合工字钢棚的主被动联合支护技术。

To study the stability and width optimization design of narrow coal pillars along the goaf of fully mechanized caving face in inclined seam,based on the analysis of the mine pressure around the coal pillars along the roadway and the empirical formula of the reasonable coal pillar width(5.61~12.46 m)of retaining roadway,FLAC3Dsimulation software was used to conduct numerical analysis and comparison of the stress field,displacement field and plastic zone distribution between the four coal pillar widths of 6,8,10 and 12 m without support.The result shows that the optimal retaining coal pillar width is 8.0 m.Therefore,based on the determination of the optimal retaining coal pillar width,the numerical analysis and comparison of the two supporting parameters are carried out by FLAC3D,and the optimum supporting parameter design of the 2214 return airway is determined,that is active and passive combined support technology of high strength anchoring cable and shotcreting I-beam shed.