超化煤矿“三软”煤层采动底板变形破坏的实测研究

通过现场应变实测系统研究了郑州矿区超化煤矿"三软"煤层底板采动变形破坏的深度及其受采动煤壁前方影响的范围。得出了在正常采动情况下厚的软煤和软底对应力和变形的传播具有一定的缓冲作用,受超前应力集中的影响,竖直应力的变化比水平应力大。揭示了中段灰岩组对应力分布和变形破坏的重要控制作用,为豫西煤炭资源向深部开采所引起的底板水防治提供了部分参考的依据。

Field measurement study on deformation and destruction of "three-soft" coal seam floor of Chaohua Coal Mine

The depth of deformation and destruction and the zone of variation in front of mining working face under the mining effect of the "three-soft" coal seam floor of Chaohua Coal Mine in Zhengzhou mining area are systematically studied by use of the field strain measurement. Thick soft coal seam and soft floor have a buffer action on the stress and deformation under the normal condition, and the vertical stress is much greater than the horizontal stress because of the influence of stress concentration. The middle section of limestone has an important controlling function to the stress distribution and deformation and destruction. It provides the basis for the seepage prevention and treatment of floor water for mining deep coal in the west of Henan Province.