露天转地下开采覆盖层漏风特性的实验研究

Experiment Study on the Air Leakage Characteristics of the Capping in Underground Mining Turned from Open-Pit Mining

大冶铁矿是由露天转地下并采用崩落法开采的矿井,生产过程中地表漏风严重,导致井下通风困难。为控制地表漏风,拟通过回填崩落围岩和抛尾矿颗粒形成覆盖层。基于实验室相似模拟实验,对4种粒径岩石颗粒的孔隙率及覆盖层的漏风特性进行了研究,得到孔隙率与覆盖层高度的关系。其结果不仅为大冶铁矿确定覆盖层高度提供理论依据,而且对其他矿山也具有参考价值。

Daye is an underground mine turned from an open-pit one that adopts caving mining method. The serious air leakage from the surface ground during mining process has led to the difficulty in underground ventilation. It was planned to form a capping layer by backfilling with the fragmented rocks and the discarded tailings so as to control the ground air leakage. Based on the laboratory analogue simulation tests, the porosity of the rock particles of four sizes and the air leakage characteristics of the capping were studied and the relationship between the porosity and the cappping height was found, providing not only a theoretical basis for determining the capping height of Daye Iron Mine but also the reference to other similar mines.