铁道建筑

针对无砟轨道路基不均匀沉降或上拱以及轨道水平偏差大于10 mm的问题，本文提出“动态孔位优化+精准注浆调控”技术体系。系统分析了抬升孔、注浆时序参数对轨道线形的影响，并进行了工程应用。结果表明：抬升孔最优角度为60°，可在保证调整效率的同时避免浆液溢出；孔边距175 mm时水平调整效果最佳，超过此值则效益递减；注浆时序采用注3 s停5 s模式能平衡抬升效应与轨道水平调整能力。该技术使两段典型上拱区段的左右股水平偏差分别从6.0、11.5 mm降至3.0 mm以内，轨道标高同步达标，整治效果显著。

Aiming at the problem of uneven settlement or upper arch of ballastless track subgrade and its large horizontal deviation(> 10 mm), this study put forward the technical system of "dynamic hole location optimization + precise grouting control". Through systematic analysis of the influence mechanism of lifting hole and grouting time sequence parameters on track alignment, it was found that the best angle of lifting hole was 60°, which can ensure the adjustment efficiency and avoid slurry overflow. When the hole margin was 175 mm, the horizontal adjustment effect was the best, and if it exceeded this value, the benefit will decrease. The mode of injecting 3 s and stopping 5 s in grouting time sequence can balance the lifting effect and track horizontal adjustment ability. The engineering demonstration showed that the horizontal deviation of left and right strands in typical upper arch section was reduced from 6 mm and 11.5 mm to less than 3 mm, the track elevation reached the standard synchronously, and the regulation effect was remarkable.