浅埋厚煤层综采工作面顶板破断结构及运动形态研究  

Study on Roof Fracture Structure and Movement Form of Fully Mechanized Mining Face in Shallow Buried Thick Coal Seam

作　　者：苗苑 MIAO Yuan(Coal Industry Planning Institute Co.,Ltd.,Beijing 100120,China)

机构地区：[1]煤炭工业规划设计研究院有限公司,北京100120

出　　处：《煤炭技术》2024年第11期88-94,共7页Coal Technology

摘　　要：针对平朔井工一矿浅埋厚煤层开采条件,采用理论分析和数值模拟的方法,对顶板覆岩破断特征及裂隙场演化规律等内容进行研究,得到了煤层开采厚度与覆岩破断结构的关系,井工一矿工作面上覆岩层形成“低位悬臂梁+高位铰接岩梁”结构,低位悬臂梁破断位置距采空区煤壁21.7 m;覆岩断裂位置与区段煤柱垂直应力的关系,当顶板断裂位置位于采空区侧时,侧向支承压力显著增大,应力集中系数约为3.02,此时煤柱稳定性差;工作面回采后,从运动到停止的4个不同阶段侧向支承压力分布特征,14106工作面回采结束92 d后处于支承应力稳定阶段;研究成果可用于指导矿井区段煤柱留设及相似条件煤层开采。In view of the mining conditions of shallow buried thick coal seam in Pingshuo No.1 mine,the fracture characteristics of roof overburden and the evolution law of fracture field are studied by theoretical analysis and numerical simulation.The relationship between the thickness of coal seam mining and the fracture structure of overburden is obtained.The overlying strata of the working face of Pingshuo No.1 mine form a structure of"low cantilever beam+high hinged rock beam",and the fracture position of the low cantilever beam is 21.7 m away from the coal wall of the goaf area.The relationship between the fracture position of overburden rock and the vertical stress of section coal pillar is that when the fracture position of roof is located on the side of goaf,the lateral abutment pressure increases significantly,and the stress concentration coefficient is about 3.02,and the stability of coal pillar is poor.After the mining of the working face,the distribution characteristics of lateral abutment pressure in four different stages from movement to stop,and the 14106 working face is in the stable stage of abutment stress 92 days after the end of mining.The research results can be used to guide the coal pillar setting in mine section and coal seam mining under similar conditions.

关 键 词：厚煤层 沿空掘巷 覆岩破断 

分 类 号：TD32[矿业工程—矿井建设] TD353