后沟煤矿煤层开采后的底板“下三带”破坏深度分析

Destruction Depth Analysis of the "Lower Three Zones" of the Floor after Coal Seam Mining in Hougou Coal Mine

井工煤矿开采后,由于矿压等因素,煤层底板会出现不同程度的变形破坏(简称为“下三带”),进而降低底板隔水岩柱的原生强度和厚度。这对于受奥灰岩溶水威胁的矿井,势必会加大矿井突水的危险。为了解决这个问题,采用现场观测试验法,井下工作面钻孔、连续注水观测的方法,成功查清了后沟煤矿煤层底板破坏深度的问题。

After underground mining in coal mines, due to factors such as mine pressure, the coal seam floor will have different degrees of deformation and damage (referred to as the "lower three zones"), which will reduce the original strength and thickness of the water-blocking rock column of floor, which will inevitably increase the risk of water inrush of the mine threatened by Ordovician limestone karst water. In order to solve this problem, the on-site observation test method and the method of borehole underground working face drilling and continuous water injection observation were used to successfully identify the damage depth of the coal seam floor in Hougou Coal Mine.