川藏铁路隧道零刷坡进洞理念与实践

Concept and Practice of Sichuan-Tibet Railway Tunnel Construction without Slope Cutting

针对川藏铁路隧道工程数量巨大,且沿线环保要求严格,生态脆弱,隧道洞口边仰坡高陡、稳定性差的工程特点,开展了隧道安全进洞方案的研究,并在两隧一桥先期开工段进行试点示范建设。通过研究和实践,提出零刷坡安全环保进洞的理念,主要包括“四不三全二尽一保护”环保进洞措施和“五不”安全进洞方法,并在后续开工的隧道设计中进行推广和应用,可确保隧道进洞安全,符合川藏铁路苛刻的环保要求。

In view of the engineering characteristics of the huge project quantity,strict requirements of environmental protection along the line,fragile ecology,high and steep front slope at the tunnel entrance and poor stability of Sichuan-Tibet railway tunnels,this paper carries out the research on the safe tunnel excavation and pilot demonstration construction in the early opening section of two tunnels and one bridge.The concept of safe and environment-friendly construction without slope cutting is put forward,mainly including the environmental protection measures of“Four imperfections,Three perfects,Two all and One protection”and the“Five Noes”safe tunnel excavation method,which are promoted and applied in the subsequent tunnel design to ensure the safety of tunnel excavation and meet the harsh environmental protection requirements of Sichuan-Tibet Railway tunnels.