Micro-plastic loess mixture mattress layer reinforcing method suitable for loess roadbed

The invention relates to a reinforcing method of a micro-plastic loess mixture mattress layer suitable for a loess roadbed. The reinforcing method comprises the following steps: cleaning a side slope; concrete foundation piles are driven in to ensure that the concrete foundation piles are exposed out of the slope surface; backfilling the excavated earthwork to form a loess backfill soil layer with fixed thickness; a first gravel mattress layer with the fixed thickness is laid on the loess backfill soil layer; arranging a reinforcement body at the pile head position of the concrete foundation pile, so that the reinforcement body and the pile head of the concrete foundation pile are connected into a whole; paving a second gravel mattress layer with fixed thickness on the first gravel mattress layer; water pipelines are laid on the left sides and the right sides of the first gravel mattress layer and the second gravel mattress layer, so that the water pipelines are communicated with the drainage channel; a plast