High fill roadbed

The utility model discloses a high fill roadbed, and aims to provide a roadbed with good drainage effect and long service life, the roadbed comprises a roadbed, supports, a drainage system and a rammed earth layer, the upper surface of the roadbed is provided with a road surface, the supports are arranged on the two sides of the roadbed, the bottom of the roadbed is fixedly connected with the top of the rammed earth layer, and the drainage system comprises a siphon drainage channel. The siphon drainage channel comprises a siphon, a water inlet section, a sealing section and a drainage section; the water inlet section is arranged at the bottom of the roadbed and communicated with accumulated water and the atmosphere; one end of the sealing section is located in the roadbed and connected with the water inlet section, the other end of the sealing section penetrates through the support and is connected with the external drainage section, and the sealing section isolates external gas and water exchange; the draina