【摘要】 超前大管棚支护是隧道施工中穿越软弱破碎围岩的一种有效的加固施工方法。通过介绍超前大管棚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,并结合重庆玉峰山隧道出口洞口段超前大管棚施工实例,对超前管棚在施工中的应用价值做一论证,有助于该方法的应用推广。更多还原

【Abstract】 Exceeding large pipe-shelf support is effective reinforce construction measure which can traverse goneness and break wall rock in tunnel construction.Combined the example of exceeding large pipe-shelf construction in tunnel exit section of Chongqing Yufeng mountain,introduction on the loading principle,design and construction key points and apply range of exceeding large pipe-shelf in bad geographical tunnel,and the application value of exceeding large pipe-shelf has been demonstrated.更多还原