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缓倾斜煤层长壁工作面支架与直接顶以及一层或几层老顶岩层能够构成统一力学体系发生相互作用。沿工作面倾向以支架为弹性基础的直接顶岩梁.伴随顺序移架和割煤工艺的进行.在基础梁上逐渐累加了直接顶的自重荷载,造成了支架阻力和顶板下沉随时间增加而逐渐增大的规律性过程。在平时影响支架阻力和顶板下沉的基本因素是直接顶厚度和支架——顶底板系统刚度.沿工作面推进方向破断的老顶岩块能够发生成拱作用形成平拱。伴随工作面推进平拱跨度增大,平拱可能发生滑动失稳或压碎失稳而造成周期来压.直接顶厚度、采高和老顶强度及厚度是影响周期来压显现的主要因素.
Gentle inclined seam longwall face support and the direct roof and one or more layers of the old roof rock can form a unified mechanical system interaction. Along the face of the tendency of the stent is based on the elastic base of the direct roof rock beam.With the sequential relocation and coal cutting process.In the basic beam gradually accumulate the weight of the direct roof self-weight, resulting in stent resistance and roof sinking over time The gradual increase of the regular process. The basic factors that affect the support resistance and the roof sinking in normal times are the direct roof thickness and the stiffness of the support-roof system. The old roof blocks broken along the working face can be arched to form a flat arch. With the increase of the span of flat arches promoted by the working face, the flat arches may cause sliding instability or crushing instability and cause periodic pressure. The direct top thickness, mining height, old top strength and thickness are the main factors that affect the periodic pressure.