Numerical simulation study on optimization of technical parameters of pier column backfilling mining in Wangzhuang Coal Mine
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摘要: 针对王庄煤矿七采区4号薄煤层采用的墩柱充填采煤法，运用FLAC3D数值模拟方法优化研究了墩柱充填开采的关键技术参数，分析了墩柱间排距、埋深、采高等技术参数对墩柱充填体长期稳定性的影响，得出了墩柱充填体稳定性随间排距、埋深、采高的增大均呈现下降趋势的结论；结合王庄煤矿七采区试验工作面条件，以弹性核区比例界定临界安全值，通过垂直应力变化进行检验，优化确定了该矿墩柱充填开采方案：墩柱充填尺寸为6 m×6 m，墩柱间排距为4 m。 实际应用结果表明，该墩柱充填开采方案使采空区充填率降低至30%，而地表最大下沉量仅为48 mm，能够有效控制地表沉降，实现了安全开采。Abstract: In view of mining method of pier column backfilling of No.4 thin coal seam in the seventh mining area of Wangzhuang Coal Mine, key technical parameters of the pier column backfilling mining were researched with FLAC3D numerical simulation method, influences of the technical parameters of interval, cover depth and mining height on long-term stability of the pier column backfilling body were analyzed, and conclusions were obtained that stability of the pier column backfilling are decreased with increasing of all the three influence factors. Combining with test condition of working face of the seventh mining area in Wangzhuang Coal Mine, a backfilling mining scheme was determined with elastic nuclear area proportion to define critical safe value and through interior vertical stress change to test it, namely the pier column backfilling size is 6 m×6 m and column interval is 4 m. The practical application result shows that the scheme of pier column backfilling makes goaf filling rate reduce to 30%, and the maximum surface subsidence is only 48 mm, which can effectively control surface subsidence and realize safe mining.
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