Expressway reconstruction and extension project embankment settlement prevention and treatment structure and prevention and treatment method thereof

The expressway reconstruction and extension project embankment settlement prevention and treatment structure comprises a plurality of sets of grouting lifting structures which are buried on steps arranged at the joint of a new roadbed and an old roadbed; each set of grouting lifting structure comprises a grouting system and a plurality of lifting systems; wherein the grouting system comprises a grouting outer pipe; the movable grouting device comprises a grouting inner pipe, a grouting chamber and a slurry suction pipe. A plurality of grouting side pipes; the lifting system comprises a lifting pipe which is located in the old roadbed and is perpendicular to the grouting outer pipe. And the waterproof geotextile bag is located in the new roadbed and is perpendicular to the grouting outer pipe. According to the expressway reconstruction and extension project embankment settlement prevention and treatment structure and method, the grouting system and the lifting system are pre-buried at the reconstruction and ex