Buttress plate and unloading plate combined retaining wall and internal force calculation method thereof

The invention relates to the field of slope support engineering, and provides a buttress plate and unloading plate combined retaining wall and an internal force calculation method thereof.The buttress plate and unloading plate combined retaining wall comprises a bottom plate, a first vertical plate, a second vertical plate, a buttress plate and an unloading plate which are all of a reinforced concrete structure; backfill is filled behind the retaining wall structure; the first vertical plate is arranged on the bottom plate, the second vertical plate is arranged over the first vertical plate, and the first vertical plate and the second vertical plate are in lap joint with the buttress plate. The unloading plate is arranged between the first vertical plate and the second vertical plate and forms an unloading pressure reduction platform; the unloading plate is in lap joint with the adjacent buttress plate and the first vertical plate and/or the second vertical plate. Horizontal soil pressure acting on the retain