软弱围岩隧道快速施工是亟待解决的一个问题，在我国，由于工装设备落后，只能通过改变施工方法加以解决。实践证明，微台阶施工方法是软弱围岩隧道施工的较好方法。武广客运专线吊沟岭隧道位于湖南省衡阳和郴州市境内，具有设计标准高(350km/h)、开挖断面大(150m2)、地质条件复杂(软弱围岩段长、断层多、岩溶发育充分)的特点，以XXTJⅣ标第二长隧吊沟岭隧道为例，探讨大断面软弱围岩隧道快速施工的方法及配套技术，给其他类似工程提供参考。

The rapid construction of tunnels in soft ground is an issue that needs to be solved urgently. In China, due to the lack of advanced equipment, the issue can only be solved by changing the construction method. Practices show that the minibench construction method is a relatively good method for construction of tunnels in soft ground. Diaogouling tunnel on WuhanGuangzhou passengerdedicated railway, located in Hengyang and Chenzhou of Hunan province, is the second longest tunnel in XXTJIV bid section. The tunnel is characterized by high design standard (with 350km/h train running speed), large excavation crosssection (with 150m2 excavation crosssection area) and complex geologies (including long distance of soft ground, numerous faults and fullydeveloped karst). Taking the construction of Diaogouling tunnel as an example, the authors discuss the construction methods and construction technologies for the rapid construction of large crosssection tunnels in soft ground in this paper, which can provide reference for similar projects in the future.