Cushion layer and composite foundation

The utility model discloses a cushion layer and a composite foundation. The cushion layer comprises a rigid cushion layer and a flexible cushion layer, wherein the flexible cushion layer is arranged above the rigid cushion layer. The cushion layer disclosed by the utility model comprises the rigid cushion layer and the flexible cushion layer; piles and soil of the composite foundation are integrated through the rigid cushion layer on the lower layer; the bearing capacity of the piles and soil is brought into full play; the flexible cushion layer is paved on the rigid cushion layer; rigid contact of a reinforced concrete foundation and the pile body and the rigid cushion layer can be avoided, so that the composite foundation has relatively good buffer and vibration-absorbing effects; the flexible cushion layer can ensure the deformation compatibility of the composite foundation piles and soil, so that the soil bearing capacity between the composite foundation piles is brought into full play; meanwhile, the flexible cushion layer can form a hydraulic channel, so as to soften the composite foundation; the rigid cushion layer can seal the hydraulic channel, and prevents accumulated water from permeating into the soil between the piles, thus the problem of single action of an existing cushion layer is solved.