大断面双线地铁隧道内撑拆除和二衬施作时机优化分析

Optimization analysis of the internal-support removal for a double metro tunnel with large sections and the construction time of secondary lining

以长沙市轨道交通2号线溁湾镇站停车区间暗挖段为依托,基于有限元软件,对双侧壁导坑法施工内撑拆除和二衬施作时机不同施工工况进行了施工过程仿真模拟.通过对比分析,指出了适合现场实际的内撑拆除方式,确定了优化的二衬施作时机.该分析结果可以指导现场施工,也可以在后续类似工程施工中采用.

Based on the Changsha Metro Line 2 Yingwanzhen Parking zone excavation tunnel,the finite element software is used for optimization analysis of the double-side- wall heading construction method internal-support removal and the construction time of secondary lining. Based on the results of the finite element numerical analysis,the appro- priate way of internal-support removal is chosen and the construction time of secondary lining is determined. The results can be used for the guidance of the site operation and can be provided as the reference for similar engineering.