为解决城市复杂地区超大断面暗挖车站拆除临时支撑和二次衬砌浇筑快速施工的难题，基于深圳地铁8号线深外站超大断面暗挖车站及连接线二次衬砌施工实践，针对该段开挖断面大、拆撑技术复杂、二次衬砌施工组织难度大等特点，在原洞内7个作业面组织施工及竖向多层支架法现浇衬砌结构的基础上，结合施工场地条件、工期节点安排、施工组织模式等条件，将洞内衬砌工作面优化为4个，减轻洞内施工组织的难度；并通过大断面二次衬砌台车的应用，减少竖向分层浇筑次数和支架模板工作量，加快整体施工进度。基于有限元数值模拟，分析得到超大断面暗挖工程开挖、拆除临时支撑和施作二次衬砌全过程的支护结构变形规律与实际施工现场高度吻合，变形均在可控范围之内。通过优化施工组织及采用二次衬砌台车，在确保安全、质量的前提下大幅提高施工进度，节约工期52 d，降低施工成本115万元。

A mined station and the connecting line secondary lining of Shenzhen Foreign Languages School Station on Shenzhen Metro Line No. 8 are characterized by super large crosssection, complex dismantling technology and difficult construction organization. To overcome these problems, the lining face in tunnel is optimized to 4 to reach smooth construction organization based on construction organization of 7 working faces and the castinplace scheme of vertical multilayer support and considering the construction site conditions, schedule node arrangement and construction organization mode. And with the application of large crosssection secondary lining trolley, the number of vertical layered pouring and the workload of support formwork has been reduced, and the overall construction progress has been accelerated. Finally, based on the finite element numerical simulation, the deformation law of the supporting structure in the whole process of excavation, demolition of temporary support and construction of secondary lining of the super large crosssection mining project is analyzed, and the analytical results coincide with the actual conditions well, indicating that the deformation is within control. By optimizing the construction organization and adopting the secondary lining trolley, the construction progress has been greatly improved on the premise of ensuring safety and quality, the construction period has been saved by 52 days, and the construction cost has been reduced by RMB1.15 million yuan.