云中山特长隧道塌方原因分析与处理

介绍了云中山特长隧道左线LK43+642～LK43+660段从发现拱顶失稳到形成塌方的全过程,从地质原因、渗裂隙水侵蚀作用、施工因素和前期地质预报欠准确等方面分析了塌方原因,结合工程具体情况提出安全可靠的塌方处理措施。处理过程中,未影响既有线结构安全,顺利完成了塌方段施工。

Causes analysis and treatment of extra-long Yunzhongshan tunnel collapse

This paper introduces the whole process of arch top instability and collapse at left railway line LK43+642~LK43+660 of extra-long Yunzhongshan tunnel,the paper analyzes the collapse causes from three aspects of geological causes,leakages and erosion,and construction factors and inaccurate preliminary geology prediction and so on.Combining with specific engineering conditions,it puts forward safe and reliable collapse processing measures.In the process of treatment,it neither influences the security of existing railway line nor fail to complete the construction at collapse section.