某地铁车站基坑盖挖法施工数值模拟分析

对武昌某地铁车站基坑盖挖法施工进行数值建模拟，经拟定合适的施工工况，对各开挖阶段的支撑变形和内力进行对比分析。结果表明:支护结构最大变形的位置会随着开挖深度的增加而逐渐下移，且支护结构中部的变形较大；在不对称开挖时，基坑支护结构的变形及内力变化较大；盖板、路面结构及荷载会加剧对其附近支护结构的影响；基坑开挖过程中，横撑的内力变化较大，不同横撑在不同的开挖阶段有不同的支护效果。

Numerical Simulation Analysis of Foundation Pit Excavation Based on Cover-excavation Method of Metro Station

To understand the impact of foundation pit excavation, the deformation caused during the foundation pit excavation is researched so that the foundation pit is supported effectively during actual construction. For this purpose, a numerical model is established for the foundation pit excavation based on the cover-excavation method of a metro station in Wuchang to determine suitable construction conditions, and perform contrastive analysis for the support deformation and internal force of all excavation stages. The results show that the maximum defection location of the support structure moves downwards with increase in excavation depth, and large deformation is caused in the middle of the support structure; during asymmetric excavation, large deformation and internal force are caused on the support structure of the foundation pit; cover plate, pavement structure and load can aggravate the impact on neighboring support structure; the change of the external force is large on the sideway support during the excavation, and different sideway supports achieves different support effect during different excavation stages.