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以大倾角煤层走向长壁采场为研究对象,分析采场覆岩运动、应力场分布特征,揭示了围岩“关键域”迁移转化特征,认为“关键域”是大倾角煤层开采覆岩垮落形成的非对称“拱壳”形态区域内对覆岩活动起决定作用的岩层,沿工作面倾斜方向“关键域”转换导致不同区域关键岩块形成层位不同,关键岩块相互作用形成倾向“梯阶”结构。根据倾向“梯阶”结构形成特征,建立倾向“梯阶”结构力学模型,分析得出不同区域“关键域”岩梁的受力特征,揭示了“关键域”岩体结构的剪破裂和张破裂机制,确定了“关键域”关键岩块的破坏失稳引起覆岩“拱壳”空间失稳模式,为大倾角煤层安全高效开采奠定理论基础。
Taking the steep-angle coal seam moving into the longwall stope as the research object, the characteristics of the overlying strata movement and stress field in the stope are analyzed, and the characteristics of migration and transformation of the surrounding rock are revealed. It is believed that the key domain is a large- In the asymmetric “arch ” shape area formed by the caving of overlying strata, the rock strata that play a decisive role in the overlying strata movement are different from the “key zone” , The formation of key rock interaction tendency “ladder ” structure. According to the tendency “ladder ” structure formation characteristics, the propensity “ladder ” structure mechanics model was established, and the force characteristics of “key field The mechanism of shear failure and fracture of rock mass structure determines the failure mode of overburden rock and arch shell in the key area of the ”key area", and establishes the theoretical basis for the safe and efficient mining of the high angle coal seam .