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多层矿体重复采动严重影响采场顶板的稳定性。结合多层矿的特点,将采场顶板视为弹性薄板,应用能量分析法推导出多层矿采场顶板的挠度和应力的解析式,总结了薄顶板的应力分布规律和破断特征,给出了顶板初次来压和周期来压的破断距的计算公式,为安全生产提供了理论依据。
Repeated mining multi-layered ore seriously affect the stope roof stability. Combined with the characteristics of multi-layer mines, the stope roof is regarded as the elastic thin plate, and the analytical formula for the deflection and stress of the roof of multi-layer mine roof is deduced by energy analysis method. The stress distribution and breaking characteristics of the thin roof are summarized. The calculation formula of the breaking distance between the initial pressure and the periodic pressure of the roof is provided for the safety production.