In this paper,the advantage of using numerical models with the strength reduction method(SRM) to evaluate entry stability in complex multiple-seam conditions is demonstrated.A coal mine under variable topography from ...In this paper,the advantage of using numerical models with the strength reduction method(SRM) to evaluate entry stability in complex multiple-seam conditions is demonstrated.A coal mine under variable topography from the Central Appalachian region is used as a case study.At this mine,unexpected roof conditions were encountered during development below previously mined panels.Stress mapping and observation of ground conditions were used to quantify the success of entry support systems in three room-and-pillar panels.Numerical model analyses were initially conducted to estimate the stresses induced by the multiple-seam mining at the locations of the affected entries.The SRM was used to quantify the stability factor of the supported roof of the entries at selected locations.The SRM-calculated stability factors were compared with observations made during the site visits,and the results demonstrate that the SRM adequately identifies the unexpected roof conditions in this complex case.It is concluded that the SRM can be used to effectively evaluate the likely success of roof supports and the stability condition of entries in coal mines.展开更多
以布尔台煤矿现采22625工作面为研究对象,对工作面现场基岩岩性及厚度进行调研采集数据,并对顶板覆岩岩性及岩层变化特征进行初步统计,以便于实验室薄基岩-支架-覆岩模型的建立。通过实验室试验和合理分析得出该种工作状况下支架的工作...以布尔台煤矿现采22625工作面为研究对象,对工作面现场基岩岩性及厚度进行调研采集数据,并对顶板覆岩岩性及岩层变化特征进行初步统计,以便于实验室薄基岩-支架-覆岩模型的建立。通过实验室试验和合理分析得出该种工作状况下支架的工作阻力约为9 500 k N。通过现场实测支架工作阻力和来压强度对比,显示所测数据均在正常范围内的11%以内,符合安全规程。这表明:在布尔台煤矿薄基岩条件下所采用的工作面支架工作阻力是科学合理的,能够有效地控制来自采场顶板的压力。展开更多
文摘In this paper,the advantage of using numerical models with the strength reduction method(SRM) to evaluate entry stability in complex multiple-seam conditions is demonstrated.A coal mine under variable topography from the Central Appalachian region is used as a case study.At this mine,unexpected roof conditions were encountered during development below previously mined panels.Stress mapping and observation of ground conditions were used to quantify the success of entry support systems in three room-and-pillar panels.Numerical model analyses were initially conducted to estimate the stresses induced by the multiple-seam mining at the locations of the affected entries.The SRM was used to quantify the stability factor of the supported roof of the entries at selected locations.The SRM-calculated stability factors were compared with observations made during the site visits,and the results demonstrate that the SRM adequately identifies the unexpected roof conditions in this complex case.It is concluded that the SRM can be used to effectively evaluate the likely success of roof supports and the stability condition of entries in coal mines.
文摘以布尔台煤矿现采22625工作面为研究对象,对工作面现场基岩岩性及厚度进行调研采集数据,并对顶板覆岩岩性及岩层变化特征进行初步统计,以便于实验室薄基岩-支架-覆岩模型的建立。通过实验室试验和合理分析得出该种工作状况下支架的工作阻力约为9 500 k N。通过现场实测支架工作阻力和来压强度对比,显示所测数据均在正常范围内的11%以内,符合安全规程。这表明:在布尔台煤矿薄基岩条件下所采用的工作面支架工作阻力是科学合理的,能够有效地控制来自采场顶板的压力。
