Large-area soft roadbed reinforcing structure

The invention relates to a large-area soft roadbed reinforcing structure which comprises a geogrid, a gravel layer and a plurality of gravel piles, positioning pieces are arranged on the end walls, facing the geogrid, of the gravel piles, and each positioning piece comprises a positioning square column, a clamping lead screw, an abutting plate and a control hand wheel; a preset groove is formed in the end wall, facing the geogrid, of the gravel pile, a locking groove is formed in the end wall, away from the gravel pile, of the positioning square column, and the end, close to the positioning square column, of the clamping lead screw is arranged in the locking groove in a threaded fit mode. The abutting plate is arranged at the end, away from the positioning square column, of the clamping lead screw and abuts against the side wall, away from the gravel layer, of the geogrid, and the control hand wheel is arranged on the side wall, away from the clamping lead screw, of the abutting plate. The reinforcing structu