English：

In the context of the ambitious “Dual Carbon” goals era, in order to improve the deficienciesof traditional supporting structures in risk control, efficiency, pollution and so on, based on the in⁃depthstudy of the new retaining wall of PC pile, the stiffness theory, design method and techno⁃economicanalysis of PC pile applied to excavation are described specifically, the technical advantages, criticalnodes and construction effects of prefabricated recycled supporting system formed by combining PC pilewith DPS inclined pile and prestressed steel composite support respectivelywhich are applied to deepfoundation excavation of different depths in soft soils are elaborated in detail. The results show that thisnew type of low⁃carbon support system is safe, reliable, green, efficient and energy⁃saving,which cannot only significantly shorten the project period, but also can effectively reduce the project cost.