Super-large multi-stage special-shaped deep foundation pit combined supporting structure

The utility model provides a super-large multi-stage special-shaped deep foundation pit combined supporting structure which comprises an upper first-stage foundation pit and a lower second-stage foundation pit which are arranged in a step shape, an enclosure wall/pile is arranged on the periphery of the first-stage foundation pit, a plurality of anchor cables are arranged on the enclosure wall/pile in the depth direction of the foundation pit, a first-stage top beam and a first-stage retaining wall are further arranged on the top of the enclosure wall/pile, and a second-stage top beam is arranged on the top of the first-stage top beam. Front-row cast-in-place piles and rear-row cast-in-place piles are arranged on the periphery of the secondary foundation pit, secondary top beams are arranged on the tops of the front-row cast-in-place piles and the tops of the rear-row cast-in-place piles respectively, and the secondary top beams of the corresponding front-row cast-in-place piles and the corresponding rear-row