摘要
为了研究浅埋煤层群开采覆岩结构破断特征与地表裂隙发育规律,以某煤矿地质条件与开采手段为工程背景,采用理论分析、数值模拟和现场实测等手段对其进行研究。通过对浅埋煤层群开采关键层破断的结构特征进行分析,研究关键层破断与地表沉陷规律,得出浅埋煤层群下位煤层开采地表移动变形规律,为浅埋煤层群开采地表稳定性控制提供依据。研究结果表明:关键层破断形成砌体梁结构,随着下位煤层继续开采,砌体梁结构容易发生滑落失稳,从而导致地表发生二次破坏变形,分析砌体梁结构失稳的影响因素可以为地表防治提供依据;通过对3#煤层覆岩破断特征与地表下沉规律进行模拟研究,得到了覆岩关键层破断对地表变形的影响规律,为矿井开采引发的地表变形问题提供了防治依据,从而减小了浅埋煤层群下位煤层开采对地表的二次破坏作用。
To study the fracture characteristics and surface fracture development of the overburden strata of shallow buried coal seams,the geological conditions and mining methods were studied in terms of theoretical analysis,numerical simulation,and field measurement.In this study,the failure characteristics of the key strata were analyzed to obtain the fracture and surface subsidence law and derive the surface movement and deformation for the lower coal seam mining,providing a basis for the surface stability control in the mining of the shallow buried coal seams.The results indicate that the key strata fracture could form masonry beams.As the lower coal seam continues to be mined,the masonry beams are prone to slippage and instability,which could lead to secondary damage and deformation of the ground surface.The factor analysis on the instability of the masonry beams could provide a basis for surface control.Simulating the fracture characteristics of the overburden strata and surface subsidence of the No.3 coal seam can demonstrate the influence of the overburden key strata breakage on the surface deformation,providing a basis for the surface deformation control caused by mining and reducing the secondary damage to the surface caused by the lower coal seam mining of the shallow buried coal seams.
作者
王元贵
WANG Yuangui(Guizhou Anhe Yongzhu Technology Co.,Ltd.,Guiyang 550000)
出处
《山西煤炭》
2023年第1期123-128,共6页
Shanxi Coal
关键词
浅埋煤层群
覆岩结构
地表变形
砌体梁结构
shallow buried coal seams
overburden structure
surface deformation
masonry beams
