Soft-scattered-rigid ternary combined pile composite foundation of saturated soft soil and construction method of soft-scattered-rigid ternary combined pile composite foundation

The invention relates to the technical field of geotechnical engineering foundation treatment, and particularly discloses a soft-scattered-rigid ternary combined pile composite foundation of saturated soft soil, which comprises a soft-scattered-rigid ternary combined pile, and the soft-scattered-rigid ternary combined pile comprises three mixing piles which are mutually engaged and lapped, the three breathable discrete piles are arranged at the axis positions in the three stirring piles correspondingly, and the permeable pipe pile is arranged at the center position of the lap joint area in the three stirring piles. The basic group reinforcement technology, the carbonization reinforcement technology and the multi-element combined pile technology are combined in composite foundation treatment, the pile body strength is rapidly improved, the low-cost pile periphery reinforcement range expansion and foundation deep drainage are achieved through multi-element piles, it is ensured that the pile forming quality is r