关键词: 运营高铁, 不均匀沉降, 复合聚醚多元醇, 异氰酸酯, 高聚物注浆抬升材料, 工程应用

Abstract: After the operation of the high speed railway, due to the long-term dynamic load of train and the harsh service environment, some sections have experienced varying degrees of uneven settlement, which seriously affects the smoothness of the line and the safe operation of train. In view of the characteristics of “uninterrupted operating” and “skylight point” short-term operation in the high speed railway projects, the performance indexes of “millimeter level” high-precision grouting lifting repair material for ballastless track was proposed, and appropriate synthetic raw materials of grouting lifting material were selected. By studying the effects of polyether polyols, isocyanates, foaming agents, catalysts, foam stabilizers, and slurry temperature on material properties, the polyurethane high polymer grouting lifting material and its proportion suitable for the grouting repair of high speed railway ballastless track have been developed. The applicability of grouting lifting material was verified by pilot test and simulated test, and it has been successfully applied to the renovation project of an intercity railway ballastless track. The results show that the ratio of H3006, ZS3035, deionized water, A33, DBTDL, AK-8805 is 30∶70∶0.6∶1.2∶1.6∶3.0 is the optimum ratio of A component slurry, and the B component slurry is equal quality PAPI. The performance indexes of grouting lifting material detected in the pilot test all reached the target value, and the grouting lifting control accuracy of the simulation test is within 1 mm, which met the grouting lifting construction requirements of ballastless track. After grouting repair, the alignment of the line is smooth, and restoring normal speed has been running normally for many years, the practice has proved that the high polymer grouting lifting material developed can be used for the grouting repair of uneven settlement of high speed railway ballastless track.

Key words: operating high speed railway, uneven settlement, composite polyether polyol, isocyanate, high polymer grouting lifting material, engineering application