紧邻地铁深基坑悬臂式挡土墙保护及基坑支护设计研究

为确保昆明轨道交通4 号线朱家村站基坑开挖及支护过程中基坑及挡土墙的安全,通过对不同深基坑支护措施及挡土墙保护方案的比选,并结合数值模拟验算结果,分析在深基坑开挖支护各工况阶段的挡土墙安全指标,选出工期短、经济性好、安全性高的挡土墙保护方案。结果表明,在挡土墙高度较小时,采用型钢斜撑结合基坑支护结构对挡土墙进行保护,安全、快捷、经济、高效, 对于以后类似条件下的紧邻深基坑挡土墙保护具有较强的参考意义。

Protection of Cantilever Retaining Wall and Support Design of Deep Foundation Pit Adjacent to Metro

In order to ensure the safety of foundation pit and retaining wall in the process of excavation and support of foundation pit of Zhujiacun Station on Kunming Rail Transit Line No. 4, comparison is made among different support measures of foundation pit and retaining wall protection schemes, the retaining wall safety indices in every working condition stage of excavation and support of deep foundation pit is analyzed based on numerical simulation and calculation results, and the retaining wall protection scheme with short construction schedule, good economy and high safety is selected. The results show that when the height of the retaining wall is small, the protection of the retaining wall, i. e. shaped steel support with foundation pit support structure, is safe, fast, economic and efficient, which can provide significant reference for the protection of the retaining wall adjacent to deep foundation pit of similar projects in the future.