大采高采场顶板断裂关键块稳定性分析

以大采高采场基本顶初次断裂对称的关键块为研究对象, 将其视为可变形体，按照严格的变形对应关系，分析回转下沉不同位置的块体变形量与水平力的关系.探索块体结构的平衡－失稳状态转化的临界点，详细分析了关键块在回转下沉过程中，作用在其上的水平力变化规律，给出了水平力与回转下沉角度、块体的块度系数以及上覆载荷和块体自身质量的量化关系式，并且给出了关键块发生滑落失稳和回转失稳时块度系数与回转角度的关系，以及关键块平衡时具有承载能力的范围.与传统近似计算方法所得结论比较，结果表明：按照严格的几何对应关系推导的结果比原来方法计算的水平力大了近1倍；关键块自身平衡作用范围增大.给出了关键块承载能力的回归计算公式，依照此公式可以预测断裂的顶板关键块是否会失稳.

Stability analysis on main roof key block in large mining height workface

Taking the key block for research object,which was the large mining height workface main roof fractured to be symmetrical during first weighting and was seen as a deformed body,strictly in accordance with corresponding relation in mechanical derivation,analyzed the relation between block deformation and horizontal force at different rotation angle and different subsidizes deformation.The critical point in balance-instability transformation of the body structure was explored;and detail analyzed the horizonta...