Considerable parts of Yunnan highway tunnels need to cross the adverse geology, such as landslide and the fractured zone, tunnel collapse happens occasionally. The collapse treatment increases project funding, which affects time limit for the project, at the same time, threats to the lives and safety of the construction workers. The reasons of tunnel collapse are more complicated, only mastering engineering geological conditions to fully understand the design intent and conduct strict control of construction methods, construction procedures, can we effectively avoid the occurrence of the tunnel collapse.%云南省公路隧道相当部分需要穿越滑坡、断裂破碎带等不良地质,隧道塌方情况时有发生,塌方处治加大了工程资金投入,影响工期,同时对施工人员的生命安全也构成了巨大威胁.隧道塌方的原因较为复杂,只有掌握工程地质条件,充分了解设计意图,严格控制施工方法、施工程序,才能有效地规避隧道塌方的发生.
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