Short pile foundation of underlying vertical ultra-deep karst cave and construction method thereof

According to the short pile foundation of the underlying vertical ultra-deep karst cave and the construction method of the short pile foundation, the short pile foundation is adopted, the arch effect of a top plate of the vertical ultra-deep karst cave is fully utilized, and horizontal radial steel pipes and inclined radial steel pipes are adopted for reinforcing the top plate of the vertical ultra-deep karst cave; pile foundation loads are transmitted to a vertical ultra-deep karst cave top plate and rock mass around the top plate through the horizontal radial steel pipes and the inclined radial steel pipes, and the horizontal radial steel pipes and the inclined radial steel pipes are connected with the pile end circular enlarged foundation reinforcement cage and the short pile reinforcement cage to form a statically indeterminate structure; the inclined radial steel pipes play a role in a tree root shape, and the pile end circular enlarged foundation is adopted to reduce the vertical stress of the bottom of