Elastic cushion vibration isolation system for building foundation along rail transit and construction technology

The invention relates to the technical field of building vibration reduction, and particularly discloses an elastic cushion vibration isolation system for a building foundation along a rail transit line and a construction technology. A building foundation bottom elastic cushion structure in the system comprises foundation soil, a concrete cushion layer, a building foundation bottom waterproof layer, a first concrete protection layer, a building foundation bottom elastic cushion, a second concrete protection layer and a building foundation bottom plate. The building underground foundation side wall elastic cushion structure comprises a building foundation outer wall, a building foundation side wall waterproof layer, a building foundation side wall elastic cushion, a polystyrene board, a protection wall and backfill soil. The building foundation bottom elastic cushion and the building foundation side wall elastic cushion of the building underground foundation form a continuous U-shaped full-wrapping structure f