巨厚煤层工作面底板突水危险性评价

为准确预测龙王沟巨厚煤层底板突水的危险性,运用五图双系数法对6煤层底板奥陶系灰岩水危险性进行评价,根据工作面底板破坏深度和底板水压资料,计算了带压系数和突水系数,采用Suffer软件绘制了底板破坏深度、底板保护层深度、底板有效保护层厚度、底板水压的等值线图,再根据三级判别标准绘制出带水头压力开采评价图。结果显示:井田西部和3个陷落柱异常区为危险区,井田中部为较危险区,井田东部为安全区。整体来看,龙王沟井田6煤层底板奥陶系灰岩发生突水的可能性较小。

Evaluation on risk of water inrush from working face floor in extremely thick coal seam

In order to accurately predict the risk of water inrush from the floor of the Longwanggou huge thick coal seam，the five-picture double-coefficient method was used to evaluate the water hazard of the Ordovician limestone water of the No.6 coal seam floor.According to the data of the floor failure depth and the floor water pressure of the working face，the zone was calculated.Pressure coefficient and water inrush coefficient，using the Suffer software to draw contour maps of floor damage depth，floor protection layer depth，floor effective protection layer thickness，floor water pressure，and then draw the head pressure mining evaluation map according to the three-level criterion.The results showed that the western part of the minefield and the three abnormal collapse column areas were dangerous areas，the middle part of the minefield was a more dangerous area，and the eastern part of the minefield was a safe area.On the whole，the possibility of water inrush from Ordovician limestone in the No.6 coal seam floor of Longwanggou Minefield was relatively small.