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公路隧道施工中的软弱围岩严重地影响着施工安全和制约着工程进度．本文阐述了飞鸾岭隧道施工中遇到的软弱围岩地段根据新奥法施工原理，采用上半断面分块开挖、超前注浆管棚支护及坍腔处理等施工方案．
The weak surrounding rock in highway tunnel construction seriously affects the construction safety and restricts the progress of the project. This article expounds the construction scheme of the weak surrounding rock encountered in the construction of Feiling mountain tunnel according to the new Austrian law, the excavation of the upper half section, the support of advance grouting pipe shed, and the collapse cavity.