Reconstruction and extension road subarea active dehydration roadbed structure and construction method

The invention discloses a reorganization and extension road subarea active dehydration roadbed structure and a construction method, an old roadbed and a new roadbed are spliced through a step excavation section, a capillary blocking layer is laid at the bottom of the new roadbed, and a plurality of layers of conductive wicking basalt fiber geotextiles are laid in the new roadbed at intervals; one end of each conductive wicking basalt fiber geotextile is embedded into the old roadbed, and the conductive wicking basalt fiber geotextiles connected with the positive electrode and the negative electrode of the direct-current power supply are alternately arranged in the vertical direction; and a time domain reflection sensor is embedded between every two layers of conductive wicking basalt fiber geotextiles at the lower part of the joint of the new road and the old road, is in communication connection with a controller of the direct-current power supply, and is used for controlling the connection or disconnection b