Construction method of red mud-based light roadbed

The invention discloses a construction method of a red mud-based light roadbed, which comprises the following steps: (1) leveling and compacting a construction site, mounting templates in different areas, and sealing the templates by adopting geotechnical cloth or a plastic film; (2) pouring red-mud-based light soil in different areas to form a red-mud-based light roadbed; the single-layer pouring thickness of each pouring area is 0.3-1.0 m, deformation joints are arranged at intervals of 10-20 m in the longitudinal and transverse directions, the step height difference of the top layer is smaller than 0.2 m, and the area is smaller than or equal to 200 m < 2 >; a geogrid and an anti-seepage geomembrane are arranged at the top of the red mud-based light roadbed; the geogrid is laid below the anti-seepage geomembrane; the anti-seepage geomembrane and the geogrid are transversely laid; the top surface and the bottom surface of the red mud-based light roadbed are wrapped by composite geomembranes; and (3) the red