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运用数值计算方法，分析了老顶在断裂前后及不同来压步距时对采场围岩的位移及应力状态的影响，为揭示采场顶板的稳定性提供了依据。
The influence of the top roof displacement and stress state on surrounding rock before and after the fracturing and the different step-by-step steps are analyzed by using numerical calculation method, which provides the basis for revealing the stability of roof.