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长拉山隧道设计高程在4400m以上,是典型的高海拔隧道,在隧道施工中受高山融雪影响隧道突水事件频发,其最大突水量达13000m3/天以上,造成了很大隧道施工安全隐患,制约了隧道施工进度。通过对隧道工程地质条件详细调查、设计文件分析,查清了突水原因,制定了科学合理地处治方案,保障了隧道施工安全,顺利通过隧道突水段,可为类似工程施工提供参考借鉴。
The design elevation of Changlashan Tunnel is above 4400m, which is a typical high-altitude tunnel. In the process of tunnel construction, frequent water inrush from tunnels is affected by alpine snowmelt. The maximum water inrush volume is over 13000m3 / day, causing great tunnel construction safety hazards , Restricting the construction progress of the tunnel. Through the detailed investigation and design documents analysis of the tunnel engineering geological conditions, the causes of water inrush were identified, and a scientific and reasonable treatment plan was formulated to ensure the tunnel construction safety and smoothly pass through the water inrush of the tunnel, which can provide reference for the similar projects.