High-steepness side slope subgrade structure for mountainous area

The utility model discloses a high-steepness side slope subgrade structure for a mountainous area, which is used for effectively lowering the construction cost on building of a high-steepness subgrade in the mountainous area and preventing the huge potential safety hazard existing in the excavation of a high-steepness side slope. The high-steepness side slope subgrade structure comprises reinforced concrete long column piles (1), reinforced concrete short piles (2), reinforced concrete joists (3) and reinforced concrete pavements (4), wherein the reinforced concrete long column piles (1) are arranged on the outer side of a high-steepness subgrade side slope and are arranged at intervals along the longitudinal direction of the subgrade; anchor ropes (5) anchored with bed rock are arranged at intervals along the vertical directions of the reinforced concrete long column piles (1); the reinforced concrete short piles (2) are arranged on the inner side of an excavation side slope of the high-steepness subgrade, and are correspondingly arranged at intervals in parallel to the outer side reinforced concrete long column piles (1) along the longitudinal direction of the subgrade; the reinforced concrete joists (3) are fixedly connected with the top of each group of corresponding reinforced concrete long column piles (1) and reinforced concrete short piles (2); and the reinforced concrete pavements (4) extend along the longitudinal direction of the subgrade, and are poured on each reinforced concrete joist (3).