不同倾角节理隧道衬砌受力特性研究及应对措施

Study on Lining Stress Characteristics of Jointed Tunnels with Different Inclination Angles and Engineering Countermeasures

深埋节理地层中的隧道开挖及运营安全面临巨大挑战。本研究以杭绍台高速铁路林盘山隧道工程为背景,针对倾斜节理岩层中隧道开挖引起的围岩变形以及衬砌结构开裂等问题,考虑不同节理倾角影响,采用岩土工程专业通用有限元软件MIDAS GTS/NX,模拟分析节理倾角对隧道围岩与支护结构应力分布、变形演化规律的影响;同时,结合现场实际条件对隧道施工与防护措施进行优化和综合分析,得出最优施工方案指导施工以避免隧道衬砌的开裂,有效保障了隧道施工和运营安全。

Tunnel excavation and operation safety in deep jointed strata have been facing great challenges.In this study,the Linpanshan tunnel project of Hangzhou-Shaoxing-Taizhou High-Speed Railway was taken as the background.In view of the deformation of surrounding rock and the cracking of lining structure caused by tunnel excavation in inclined jointed rock stratum,the influence of different jointed inclination angles was considered.The finite element software MIDAS GTS/NX,which was a common finite element software for geotechnical engineering,was used to simulate and analyze the influence of jointed inclination angle on the stress distribution and deformation evolution law of tunnel surrounding rock and supporting structure.At the same time,combined with the actual conditions of the site,the tunnel construction and protection measures were optimized and comprehensively analyzed to obtain the optimal construction scheme and guide the construction to avoid the cracking of the tunnel lining,which effectively guaranteed the construction and operation safety of the tunnel.