摘要
缓倾斜工作面上覆岩层运动特征不同于近水平煤层,为探究缓倾斜特厚煤层综放开采覆岩破断运移规律偏移特性,以缓倾斜特厚煤层综放工作面为工程背景,采用理论分析、数值模拟及现场实测相结合方法,分析覆岩破断运移规律、覆岩应力场分布特征以及工作面矿压显现规律。研究发现,缓倾斜工作面顶板下沉曲线中心位置向下侧偏移,最大水平位移量明显大于水平煤层,采空区破碎围岩沿煤层倾角向下滑移,覆岩破断形态整体呈非对称的“斜梯形”,下侧实体煤中形成了“马鞍形”裂隙发育区,偏低一侧的顶板岩层破碎度更高、裂隙发育更明显,工作面中下部来压强度普遍大于上部来压强度。结果表明,缓倾斜特厚煤层综放开采工作面上覆岩层破断运动呈现明显非对称性,沿工作面倾角向下部一侧偏移明显,工作面下部一侧受上部岩体垮落、滑移冲击影响,采场上覆岩层破坏、应力场及工作面矿压显现均高于上部一侧,数值模拟覆岩破坏规律与现场实测工作面矿压显现数据呈现对应一致性。
The movement characteristics of overlying strata on the slow inclined working face are different from those of the near-hori-zontal coal seam.In order to explore the overburden fracture migration characteristics in the fully-mechanized mining of slow inclined super thick coal seam,taking the fully-mechanized mining working face of slow inclined super thick coal seam as the engineering back-ground,a combination of theoretical analysis,numerical simulation,and on-site measurement methods were used to analyze the overbur-den fracture migration law,the stress field distribution characteristics of the overlying strata,and the rock pressure manifestation law of working face.Research has found that the center position of the subsidence curve of slow inclined working face roof is offset downwards,and the maximum horizontal displacement is significantly greater than that of horizontal coal seam.The fractured surrounding rock in the goaf slides downwards along the dip angle of coal seam,and the overall shape of overburden fracture is an asymmetric"inclined trape-zoid".A"saddle shaped"crack development zone is formed in the lower solid coal,and the rock layer on the lower side of the roof has higher fragmentation and more obvious crack development.The compressive strength of the lower part of working face is generally greater than that of the upper part.The results show that the fracture movement of overlying rock strata on the slow inclined super thick coal seam fully-mechanized mining face exhibits obvious asymmetry,with significant displacement towards the lower side along the dip angle of working face.The lower side of working face is affected by the collapse and sliding impact of the upper rock mass,and the overlying rock strata,stress field,and rock pressure manifestation of working face are higher than those of upper side.The numerical simulation of overburden failure law shows corresponding consistency with the on-site measured data of rock pressure manifestation in working face.
作者
杨学孟
Yang Xuemeng(Zhundong No.2 Mine,State Grid Energy Zhundong Coal and Power Co.,Ltd.,Changji 831800,China)
出处
《能源与环保》
2025年第11期339-347,共9页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家重点研发计划资助项目(2023YFC2907501)。
关键词
缓倾斜特厚煤层
综放开采
覆岩破断运动
矿压显现
偏移特性
slow inclined super thick coal seam
fully-mechanized caving mining
overburden fracture movement
rock pressure manifes-tation
migration characteristic
