The invention discloses a special soil
subgrade structure and a construction method thereof. The special soil
subgrade structure comprises a special soil, a triple-combined soil, a cohesive soil, a gravel
cushion and a triple-combined soil
base course, wherein bamboo filaments are additionally mixed in the triple-combined soil. According to the invention, the
bearing capacity and the stability of the special soil
subgrade structure can be improved; influences of extraneous water, such as side slope seepage,
surface water, underground water and the like, on special soil can be also effectively blocked; the special soil sensitive to water, such as an
expansive soil, a collapsible
loess, a red clay, a salinized soil and the like, can be directly used for laying of the subgrade; building fillers can be sufficiently utilized to avoid spoiling of excavation soil, borrowing of fillers and transferring of the fillers; and the adoption of a novel bamboo material as reinforcing and slope-protecting materials adapts to a demand that the civil
construction industry is developed towards low-carbon, energy-saving, environment-friendly and sustainable directions. Therefore, the special soil subgrade structure disclosed by the invention can save project investment and is energy-saving and environment-friendly.