Abstract: A green deep excavation support method based on all steel support structure is proposed to address the problems of low construction efficiency, non-recyclable materials, and adverse environmental impact of traditional support systems of deep excavation in soft soils. By establishing a finite element numerical model and a multi-dimensional plan comparison mechanism, the collaborative bearing mechanism and the ecological benefits of the steel support system in soft soils are analyzed in detail. Research has shown that the “bow shaped” displacement distribution pattern formed by the synergistic effect of steel supports and piles can effectively control the deformation of the deep excavation and reduce disturbance to the surrounding environment; Compared with the traditional concrete support technology, the new system shows breakthrough improvements in construction organization efficiency, the material recycling, and the carbon emissions. Through the modular design and the steel component recycling, this technology achieves multi-objective coordination of safety control, resource conservation, and low-carbon construction. Engineering practice has verified that this system provides an innovative solution for the deep excavation in soft soils in highly sensitive environments that combines structural safety and ecological friendliness through the effective integration of mechanical properties and sustainable attributes.

Key words: Reusable, Excavation Support, Soft Soils