Abstract: In alignment with the national strategy for achieving carbon peak and carbon neutrality, the authors investigate the green transformation of construction practices through a case study of the Caozhuang station on the JiaxingFengnan city railway. A design scheme for constructing an underground station using the Continuous open caisson method is introduced. This innovative approach involves the progressive compression of continuously distributed open caissons in batches, which are subsequently interconnected to form a cohesive underground station structure. The authors highlight key techniques involved in this method, including the establishment of permanent connections, structural integration, control of differential settlement, and mitigation of environmental impacts. When compared to the traditional opencut construction method, this approach significantly reduces project costs by eliminating the need for extensive temporary structures, mitigates the risk of confined water ingress through undrained excavation, and shortens the construction timeline by allowing simultaneous structure formation and soil excavation. Owing to its minimal environmental footprint, this method is particularly suited for use in environmentally sensitive areas.

Key words: soft soil, continuous open caisson method, rail transit, underground station