特厚煤层开采覆岩运移规律的相似模拟研究

Similarity simulation study on overlying rock migration law of the excavation of extra-thick coal seams

特厚煤层开采覆岩运移直接影响矿井的安全高效生产。以郭家河煤矿为研究对象,在系统分析该矿3号煤层首采工作面地质条件的基础上,研究了2个相邻综放工作面开采过程中的覆岩破断特征和地表下沉规律。研究结果表明,在煤柱支撑作用下,与工作面两端相比,上覆岩层在工作面的中部位置下沉最为明显;随着相邻工作面区段煤柱的变形失稳,当其上覆围岩的拱形结构发生破坏时,上覆岩层将出现整体下沉。研究成果有助于推动郭家河煤矿特厚煤层安全高效开采。

The movement of overlying strata of extra-thick coal seam will directly affect the safe and efficient mining.Taking Guojiahe Coal Mine as the research object,based on the systematic analysis of the geological conditions of the first mining face of the No.3 coal seam,the characteristics of overlying rock fracture and surface subsidence during the mining process of two adjacent fully-mechanized caving faces were studied.The research results indicate that under the support of coal pillars,the subsidence of the overlying rock layer in the middle of the working face is most significant compared to the two ends of the working face.As the deformation and instability of coal pillars in adjacent working face sections occur,when the arch structure of the overlying rock mass is damaged,the overlying rock layer will experience overall subsidence.The relevant research results will help promote the safe and efficient mining of the extra thick coal seam in Guojiahe Coal Mine.