特厚煤层综放开采侧方临空覆岩空间结构运动规律及煤柱宽度研究

Research on Motion Law of Overlying Strata Spatial Structures Adjacent to Lateral Goaf and the Width of Coal Pillar in Full-mechanized Caving Mining in Extremely Thick Coal Seam

基于郭家河煤矿1305工作面回风巷围岩破碎严重、巷道变形大的开采现状,综合运用现场实测、矿压理论、断裂力学及数值模拟等多种方法,对工作面进入侧方采空区支承压力影响范围前后的巷道围岩变形与破碎状况、侧方覆岩空间结构运动规律、合理区段煤柱宽度等进行了分析。研究结果表明:侧方采空区影响下,临空巷道表面变形量与围岩破碎程度显著增加;侧方覆岩结构破断形成"弧形三角块",B岩块起到关键性作用;保证巷道围岩稳定的区段煤柱宽度不应小于35m。

Based on present situation of exploitation that the surrounding rock crushing seriously and the roadway deformation largely,in 1305 working face air return way of Guojiahe Coal Mine,varieties of methods,such as field measurement,ground pressure theory,fracture mechanics and numerical simulation are used to analysis the surrounding rocks＇ crushing and deformation status before and behind lateral goaf,motion law of overlying strata spatial structures and reasonable section pillar width. Results shows that,under the influence of lateral goaf,the lateral crossheading surface deformation amount and the surrounding rocks fragmentation degrees were significantly increased,the lateral overburden spatial structures were breaking,then the ＂arc triangle block＂was formed,and the B rock block plays a key role. At last,to ensure the stability of roadway surrounding,the width of coal pillar section should not be less than 35 m.