Pile-wall combined supporting structure for supporting deep foundation pit and construction method of pile-wall combined supporting structure

The invention discloses a construction method of a pile-wall combined supporting structure for supporting a deep foundation pit, which mainly comprises the steps of rotary excavating secant pile construction, reinforcing pile construction, joint pouring and the like, and is characterized in that secant pile construction is adopted for the deep foundation pit, and reinforcing piles are additionally arranged around the secant pile construction for connection, so that the supporting use of different deep foundation pits is met; through secant pile construction, reinforcing piles are additionally arranged on the outer side, and meanwhile, through reinforced concrete fixation, the deep foundation pit construction risk caused by collapse and pile body inclination due to soil pressure is reduced; the secant piles and the reinforcing piles are connected through the reinforced concrete, so that the stable supporting performance is improved, the pile body inclination risk is avoided, and the overall stability is improv