Construction method for foundation pit supporting under muddy geological conditions

The invention relates to the technical field of foundation pit supporting in foundation pit engineering, and discloses a construction method for foundation pit supporting under muddy geological conditions. The construction method comprises the following construction methods that (1), preparation is carried out before construction; (2), a first-stage slope elevation is excavated; (3), mixing piles are reinforced on the elevation of a transition platform; (4), a reinforced concrete slab is constructed within the reinforcing range of the mixing piles of the elevation of the transition platform; and (5), a second-stage slope is excavated to the pit bottom. Through the whole construction process, the construction cost can be effectively reduced, the engineering cost can be reduced, reinforcing measures are reliable, steel pipes are inserted and pile top reinforced concrete plates are constructed, the integrity and rigidity of the mixing piles are enhanced, the pit top displacement amount is effectively reduced, an