Earthquake region roadbed supporting, retaining and damping structure and construction method thereof

The invention discloses an earthquake region roadbed supporting, retaining and damping structure and a construction method thereof. The damping structure comprises a side ditch, a side ditch platform, a reversed filtering layer, an energy-dissipating and damping layer, a soil retaining wall, a wall top platform and a drainage hole; the side ditch platform is arranged on one side of the side ditch; the reversed filtering layer, the energy-dissipating and damping layer and the soil retaining wall are arranged between the side ditch platform and a reinforced rock-soil body slantways; the reversed filtering layer, the energy-dissipating and damping layer and the soil retaining wall are arranged outside the reinforced rock-soil body sequentially from inside to outside; the lower part of the soil retaining wall slantways extends to the lower part of the side ditch platform; the lower parts of the reversed filtering layer and the energy-dissipating and damping layer are in parallel and level with the upper surface o