近松散含水层下煤层安全开采留设防砂煤柱可行性研究

Feasibility Study on Sand-proof Pillar for Safe Coal Mining under Nearly Loose Aquifer

为了近松散含水层下煤层的安全合理的开采,基于留设安全煤柱的重要性,探讨了淮北矿业集团青东矿13采区松散层中的第三隔水层和第四含水层的水文地质特征,研究了采区覆岩结构和风化带的特点,认为采区主采7煤层的原防水煤岩柱的留设造成了大量的煤炭资源浪费。通过对影响留设防砂煤柱留设的因素进行分析,得出把原来留设的防水煤柱改为防砂煤柱是可行的,从而确定13采区近松散层留设的安全煤柱为防砂煤柱,把开采上限提高了47.98m,提高了安全开采上限,并且保证了矿井的安全开采,创造了较大的经济效益。

For safe and rational coal mining under nearly loose aquifer, considering the importance of safety pillar, discussed hydrogeo-logical characteristics of the third aquifuge and the fourth aquifer in loose bed in No. 13 winning district, Qingdong coalmine, Huaibei Mining Group, studied characteristics of overburden structure and weathering zone in the winning district, have considered that the orig- inal setting of safety pillar for main mineable coal 7 caused waste of large amount of coal resource. After analyzed the contributing fac- tors of sand-proof pillar setting, figured out that altering original water barrier into sand-proof pillar is feasible. Consequently deter- mined No.13 winning district safety pillar setting for nearly loose bed as sand-proof pillar, thus elevated the safe mining upper limit 47.98m, and guaranteed safe working, created rather large economic benefit.