长大管棚超前支护在铁路隧道洞口施工中的应用

摘要

通过介绍超前大管棚支护在不良地质隧道施工中的受力原理、大管棚设计与施工要点及适用范围等内容，并结合新凤凰二号隧道进出口洞口段长大管棚超前支护施工实例，总结了长大管棚超前支护技术在通过软弱围岩时的作用。%By introducing the force principle of large pipe roof advanced support in poor geological tunnel construction, design and construction elements of large pipe roof and the scope of application, combined with the case of long and large pipe roof advanced support construction of Xinfenghuang No.2 tunnel hole, this paper summed up the role of long and large pipe roof advanced support technology through weak rock.