大倾角软煤综放工作面“顶煤-支架”关系区化特征

1.西安科技大学 能源学院,陕西 西安 710054,2.教育部 西部矿井开采及灾害防治重点实验室,陕西 西安 710054; 3.中煤科工集团西安研究院,陕西 西安 710077

临界失稳条件; 采动应力分布; 岩体结构变异; 控制措施

Regional interaction behavior of “top coal-support”on fully-mechanized caving face in soft steeply dipping seam
WU Yong-ping1,2,LANG Ding1,WANG Yi-lin3

(1.College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.Key Laboratory of Western Mine Exploration and Hazard Prevention,Ministry of Education,Xi'an 710054,China; 3.Xi'an Research Institute of China Coal Technology and Engineering Group,Xi'an 710077,China)

critical condition of instability; mining-induced stress distribution; rock structure variation; control measures

DOI: 10.13800/j.cnki.xakjdxxb.2017.0302

备注

大倾角软煤长壁综放工作面顶煤破碎程度高、端面漏冒频发,顶煤与支架的约束关系复杂且沿倾斜方向具有明显的区化特性,支架稳定性控制难度大。基于理论分析与物理相似材料模拟实验方法,确定了“顶煤—支架”系统失稳临界条件,揭示了顶煤区化破坏机理。结果 表明:松软顶煤的漏冒是支架失稳的主要影响因素,顶煤的碎裂程度与支架稳定性呈负相关关系,受岩体结构变异作用顶煤受到的顶板载荷具有显著的非对称性,沿倾斜方向顶煤碎裂程度呈现出“中上部>上部>中部>下部”的区域性差异,工作面支架稳定性将产生与之相一致的区化特征。并通过现场实践,验证了支架稳定性区化特征,提出了相应的支架稳定性控制措施。

Fully-mechanized longwall caving face in soft steeply dipping seam has the following characteristics as high top coal failure degree and frequent caving.Relationship between top-coal and support is extremely constrained,and support stability is difficult to control.Based on theoretical analysis,numerical simulation and similar material simulation methods,the critical condition of top coal-support system instability have been determined and regional breaking characteristics of the top-coal have been considered.Results show that the caving of soft top coal is the main influential factor of the instability of support,and the relationship between breaking degree of top coal and support stability presents negative correlation under the mining-induced stress.Under the function of rock structure variation,the roof loading on top-coal shows obvious asymmetry.The breaking degree of top coal presents regional characteristics along thedirection of incline,showing the highest in the middle-upper area,higher in upper area,less in middle area and lowest in bottom area,and support stability along inclined direction of the working face will present the same regional characteristics.With in-situ testing,regional characteristics of support stability have been verified and relevant control measures of support stability have been proposed.