本文将老顶岩层视为“板”的结构模型,在实验“板”的三种破坏型式的基础上,考虑“板”在四种不同的边界条件下,工作面长度b与其推进度a对“板”结构内产生的弯矩的影响,建立了在不同条件下工作面长度与老顶初次断裂步距之间的关系式,为探索工作面端头事故成因、预报老顶初次来压提供理论依据。 In this paper, the old roof rock is regarded as the structural model of “slab”. On the basis of the three failure modes of “slab” in the experiment, considering the “slab” under four different boundary conditions, the length of working face b and its propulsion a The relationship between the working face length and the initial breaking step distance of the roof under different conditions has been established. In order to explore the cause of the head end accident in the working face and predict the initial pressure of the old roof to provide Theoretical basis.