摘要
成昆铁路复线(新成昆铁路)隧道建设过程面临软岩大变形、塌方、涌水、涌泥(砂)等工程地质问题.为保障施工安全和工程进度,针对岩溶隧道涌水严重的问题,提出"探、截、绕、排"相结合的隧道涌水处理技术;针对富水软弱围岩隧道涌泥涌砂等问题,增设平导实现超前泄水、分水和释能减压,采用"堵排结合"的注浆工艺,由贫水区向丰水区逐步注浆以提高隧道稳定性;针对隧道软弱围岩变形严重的问题,采用长短锚杆加固围岩优化隧道结构,提高隧道变形能力.结果表明:1)增设平导可解决富水软弱围岩涌泥涌砂难题;2)长短锚杆结合对软弱围岩能起到抑制变形作用;3)验证了平导在岩溶富水隧道具有较大的功能和作用.
Abstract
The construction of tunnels on the Chengdu-Kunming 2nd railway encounters numerous geological challenges,including significant soft rock deformation,collapse,and water and mud gushing.To ensure construction safety and maintain project progress,a comprehensive tunnel water gushing treatment methodology,comprising exploration,interception,bypass,and drainage,is proposed for karst tunnels.In settings characterized by water-rich surrounding rocks and severe water and mud gushing,parallel heading tunnels are deployed to facilitate advance water discharge,water separation,and energy release and decompression.Additionally,a grouting technology termed"sealing and drainage"is utilized,applying grout from water-poor to water-rich sections.For tunnels surrounded by soft rocks with pronounced deformation,both long and short bolts are employed to reinforce the surrounding rock,thereby optimizing tunnel structure and enhancing its anti-deformation capacity.The implementation of these technologies has demonstrated effectiveness and offered distinct advantages in applicable tunnels.
维普
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