通过总结人工挖孔桩事故的引发原因，采用事故树分析方法对其安全性进行了评价，得出了若干种可能的破坏模式，并对各基本事件进行结构重要度分析，得出当一些事件处在仅含其本身的最小割集时，它们的结构重要度相同的结论。%On the basis of cause reason,safety assessment of manual excavation pile by FTA is introduced,several potential failure modes is ob-tained. By analyzing structural importance of all basic events,it is concluded that its importance is same when some events are in minimal cut sets which contain itself.
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