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本文研究了反弹的机理，指出了用弹性基础梁理论来解释反弹的片面性，并讨论了用反弹进行顶板断裂预报的工程意义。
This paper studies the mechanism of rebound, points out that the elastic foundation beam theory can be used to explain the one-sidedness of the rebound, and the engineering significance of using the rebound to forecast the roof fracture is discussed.