以兰渝铁路胡家湾隧道进口段施工为例，介绍泥岩地层修建大断面隧道变形控制的方法。施工中通过围岩量测掌握围岩变形动态，采取分部开挖临时仰拱封闭成环及上半断面扇形支撑的技术措施，控制围岩的变形。实践证明:效果较好，对目前的客专大断面隧道控制大变形施工有一定的帮助。

The deformation control method for large crosssection tunnels in mudstone ground is presented, with the construction of the entrance section of Hujiawan tunnel on LanzhouChongqing railway as an example. During construction, monitoring is executed to master the status of the rock mass deformation and temporary inverts and fanshaped supports are installed for the tunnel constructed by "top heading and bench" method so as to control the deformation. In the end, satisfactory results are achieved. The paper can be served as reference for the deformation control of the large crosssection tunnels on passengerdedicated railways.