Study on the Working Properties of Integrated Support Structure of Precast Piles with Toothed Curtains

The integrated support structure of precast pile with tooth curtain is a new type of unsupported support system formed by the precast pile implanted into the tooth curtain wall. The horizontal displacement changes of the slope top and pile top and the distribution characteristics of earth pressure behind the wall are studied and analyzed through the actual engineering field loading test, and the finite element numerical simulation is carried out. By comparing and analyzing the supporting performance of different supporting forms, the stress deformation rule and working mechanism of the integrated supporting structure of prefabricated pile with tooth curtain under different excavation depths are studied. The results show that: The integrated support structure of precast pile with tooth curtain can effectively limit the deformation of stratum and envelope structure, and the existence of tooth wall changes the stress deformation behavior of traditional cantilever pile wall support, and transfers and bears part of earth pressure through soil arch effect and side wall friction, which has an obvious load reduction effect. Compared with cantilever pile row support and pile row + curtain wall support, the integrated support structure of prefabricated curtain pile can greatly reduce the ground settlement, pile displacement and bending moment, improves the safety and stability of foundation pit support.