同时指出，顶板岩层流变会降低顶板结构承载能力，促使变形失稳发生。
It is also pointed out that rheology of roof rock will reduce the carrying capacity of roof structure and will induce deformation instability.
同时利用有序熵给出岩层对比分析的方法。
Layer correlation analysis methods based on ordered entropy are also given.
本文在力学模型的基础上，利用弹性理论的位移函数法导出了长壁采煤法采空区上方岩层及地表移动的函数表达式，同时给出了岩层及地表最大移动值的计算公式。
Based on the model of mechanics, some functional formulae of strata and surface movement above longwall mining goaf are derived by using the displacement method of theory of elasticity.
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