黄土覆盖矿区非连续推进长壁工作面开采技术研究

Coal Mining Technology of the Discontinuous Advancing Long-wall in the Mines Covered by Loess

针对黄土覆盖矿区"三下"压煤量很大的现象,提出了一种基于非连续推进的长壁工作面来控制地表沉陷的开采工艺,即通过在工作面推进方向上留设合理的间隔煤柱,并适当调整工作面的开采宽度,以使地表形成双向极不充分采动,从而达到控制地表沉陷、保护建筑物的目的。并利用该方法确定开采宽度和煤柱宽度,采用数值模拟计算进行地表移动、变形大小及煤柱破坏程度分析。计算结果表明,采用非连续推进的长壁工作面的设计是可行的,提高了煤炭资源的采出率,为解决黄土覆盖矿区"三下"压煤开采、延长老矿井的生产周期、实现建筑物不拆迁情况下安全开采提供了一种技术途径。

According to the phenomenon of a large number of coal under building,roadway,and water body in the loess covered mine,a minging technology based on non-continuous advancing of the long-wall mining is put forward,to control surface subsidence in mining process. It consists of leaving reasonable interval coal pillar in the direction of the working face,and appropriate adjustments of the mining width of the working face,in order to make utmost non-full bidirectional extraction in the surface,to control surface subsidence and protect the building. Then using this method,the width of coal mining and pillars are determined,and the surface movement,the deformation and the failure degree of coal pillars are calculated by the numerical simulation. The results show,that design of discontinuous advancing long-wall is feasible,the recovery rate of coal resources improve. It＇ s a technical approach to coal minging under building,roadway,and water body in the loess covered mine,extend the production period of the old mine,realize the safety of building without demolition.