Tunnel collapse is the most common accident in tunnel construction, which is often caused by deformation of weak surrounding rock. In this study, the writers take Dujiaying Tunnel as example, briefly elaborate transform breakage characters of surrounding rock activity fault zone in Dujiaying Tunnel, and do reason analysis of collapse and roof fall at the tunnel exit, and also put forward corresponding remedial measures, evaluate the implementation effect of tunnel collapsing to provide reference and solution for similar engineering accidents.%坍方是最为常见的隧道施工事故，且多因软弱围岩大变形引起。本文以杜家营隧道为例，阐述杜家营隧道活动断裂带围岩的变形破坏特征，对隧道出口坍方冒顶进行原因分析，提出处理措施，并对坍方处理效果进行评价，以期为类似工程事故预防与处理提供参考。
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