The paper takes the engineering as the example to analyze the impact on four factors of different rock types un -der earthquakes ,such as the strength of rock ,the integrity of rock mass ,the state of structural surfaces ,the state of ground water.The paper is an elementary discussion about the cause of broken on brittle rock ,it has a guiding on surrounding rock classification of tunnel ,that is situated in sharp earthquake zone .%以工程为实例, 针对不同类型的岩石, 研究岩石强度、 岩体完整程度、 结构面状态、 地下水状态等在多次地震作用下的影响程度, 初步探讨脆性岩石的破碎原因, 对中强地震带的隧洞围岩分类有指导作用.
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