南昆铁路隧道修建中坍塌变形与山体病害的关系及主要对策

PRELIMINARY EXPLORATION ON RELATIONSHIP BETWEEN COLLAPSE DEFORMATION AND MOUNTAIN DEFECTS OF TUNNEL CONSTRUCTION AND COUNTERMEASURES ON NANNING KUNMING RAILWAY

本文分析了南昆线隧道修建中的坍塌变形与山体病害互相作用的关系，以及产生坍塌变形的主要原因。本文介绍了隧道施工的三个实例，并提出隧道防止坍塌和变形的措施，一方面，要从设计上增加防止山体滑动的工程措施，比如：抗滑桩、锚索桩等。另一方面，施工过程中要减小开挖断面，缩短不稳定围岩的暴露时间，并及时加强支护，而且支护要及时闭合成环。

This paper analyses relationship between collapse deformation of tunnelling construction and mountain's defects on Nanning Kunming Railway and gives the main reasons about collapse of tunnels.This paper introduces some experiences of three examples of tunnels and proposes also to add some measures to prevent the slip of mountain in the design,for example: add anti slide pile,anchored pile, etc.On the other hand,in the process of tunnelling construction,we should reduce the section of the tunnel excavation and reduce the time of unstability surrounding rock without supporing,strengthen the supports on time and shape the circular section in time.