红层泥质岩地区高铁深路堑持续上拱整治技术研究

Study on Continuous Upward Arch Treatment Technology of High-Speed Railway Deep Cutting in Red-Bed Mudstone Area

鉴于目前缺乏针对川中红层导致的路基上拱病害治理措施的成熟研究的现状,论文以川中地区某高铁站为工程背景,对路基上拱机理及发展趋势进行预测分析,并采用小跨度刚构悬臂板结构对该案例路基上拱进行整治。研究发现,泥岩中黏土矿物以伊利石为主,为路基膨胀上拱的物质基础;非饱水状态的泥岩具有极强的吸收空气中水分产生显著膨胀变形的能力;预计整治段累计上拱变形量为60 mm,预计2020年至2043年上拱变形量为20 mm;经整治目前高铁已实现全线350 km/h达速运营,与整治前相比的最小通勤时间已压缩至62 min,整治效果明显。

In view of the lack of mature research on the treatment measures of roadbed arch disease caused by red layer in central Sichuan,taking a high-speed railway station in central Sichuan as the engineering background,this paper predicts the mechanism and development trend of roadbed arch.The small-span rigid frame cantilever plate structure is used to renovate the upper arch of the roadbed in this case.It is found that the clay mineral in mudstone is mainly Illite,which is the material basis of roadbed expansion arch;the unsaturated mudstone has a strong ability to absorb water in the air to produce significant expansion deformation;it is estimated that the cumulative upper arch deformation of the regulation section is 60 mm,and the predict upper arch deformation from2020 to 2043 is 20 mm.After renovation,the high-speed railway has achieved full-line 350 km/h speed operation,and the minimum commuting time compared with that before regulation has been reduced to 62 minutes,and the regulation effect is obvious.