超大断面处马头门破除关键技术探析

Analysis of key technologies of ingate breaking at super-large cross section

针对马头门处施工不当易造成原结构的变形,增大地表的沉陷,严重时甚至引起结构破坏的问题。结合贵阳地铁某车站斜井入超大断面正洞时的处置方法,对马头门开挖方法做了详细的介绍,同时,阐述了马头门处一些常见问题,为类似工程施工提供经验借鉴。

The improper construction of ingate can easily cause the deformation of the original structure,increase the subsidence of the surface,and even cause the structural damage when it is serious. The excavation method of ingate is introduced in detail based on the disposal method at the entrance of a inclined shaft in Guiyang Metro Station. At the same time,it expounds some common problems in ingate. To provide experience for the construction of similar projects.