厚松散层薄基岩下煤柱留设类型转变研究

Study on Type Change of Coal Pillar Setting under Thin Bedrock with Thick Loose Bed

通过对鲍店煤矿八采区山西组主采3煤顶部基岩及第四系下组2个主要充水含水层富水性特征的分析,确定其转变为防砂煤柱留设是安全可行的。针对采区山西组主采3煤层较大部分存在分叉现象的实际情况,分别计算了3上煤层和3煤层的留设高度;3上煤层与3下煤层属于近距离煤层开采,在重复开采条件下计算了3下煤层留设高度。

Making a detailed analysis of the water-rich characteristics on the two main water-filled aquifers,the top bedrock of No.3 coal mining group in Shanxi formation and the lower group of Quaternary. Shifting to sand-proof pillar mining is safe and feasible. Based on most of bifurcation phenomena existing in the No.3 coal seam of Shanxi formation, the setting height of No.3 upper coal seam and No.3 coal seam is calculated respectively. No.3 lower coal seam and No.3 upper coal seam belong to the short range seam mining, the setting height of No.3 lower coal seam is calculated in the repeated mining conditions.