High-speed railway expansive soil road culvert transition section reinforcing structure and construction method thereof

The invention discloses a high-speed railway expansive soil road culvert transition section reinforcing structure and a construction method thereof, and relates to the technical field of geotechnical engineering expansive soil road culvert transition section reinforcing treatment. The reinforcing structure comprises a box-type culvert structure, a foundation bed layer, an expansive soil foundation, a differential deformation self-adaptive structure layer, a geogrid reinforced layer, a spiral pile, an inverted trapezoidal transition structure and an upper grid layer. According to the reinforcing structure disclosed by the invention, longitudinal differential swelling deformation generated by the swelling soil road culvert transition section of the high-speed railway under the action of water immersion and longitudinal differential settlement deformation generated by the swelling soil road culvert transition section under the action of water loss can be regulated and controlled; and it is guaranteed that longit