The paper mainly analyzes the impact of rockfall impaction upon secondary lining,and introduces the methods of calculating rockfall compaction force. Through computing lining compaction load,it draws some valuable conclusions. In addition,the indirect influence owing to lining back cavity should be noticed seriously.%主要分析了落石冲击对二次衬砌的影响，介绍了计算落石冲击力的方法，并通过初砌冲击荷载设计值的计算，得出了一些有价值的结论，指出衬砌背后产生空洞后，其所产生的间接影响应引起高度重视。
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