针对城市大型地下空间开发建设过程中面临的保护运营地铁安全的难题,从运营地铁隧道的构造特点和变形保护技术标准入手,根据软土深大基坑的地质及工程特点,针对基坑卸载变形产生和发展的不同成因机理,研究总结了一系列针对性强的软土深大基坑微变形控制设计技术,在工程应用中取得了良好的微变形控制成效,保障了城市地铁的安全正常运营。 Aiming at the problem of subway safety in the process of developing and constructing large-scale urban underground space, this paper starts with the operation characteristics of subway tunnel and the technical standards of deformation protection. According to the geological and engineering characteristics of deep foundation pit in soft soil, Generation and development of different causes of mechanism, the study summarized a series of targeted deep soft soil deep deformation control design technology, engineering applications have achieved good effect of micro-deformation control to protect the safety of urban subway normal operation .