铁道科学与工程学报2024，Vol.21Issue(6)：2417-2429,13.DOI:10.19713/j.cnki.43-1423/u.T20231472
基坑开挖引起地铁结构隆起的堆载控制研究
Loading control for the uplift of subway structures induced by adjacent excavation
摘要
Abstract
Excavation of a foundation pit could induce additional deformation of nearby subway stations and tunnels.To effectively control the uplift of the subway structure,a foundation pit project adjacent to the operating subway structure in Tianjin was selected as the example.The vertical deformation of the subway station and tunnel during the excavation process was analyzed by organizing the measured data during the excavation process.Base on this analysis,a numerical simulation method was employed to fit the field monitoring data.The effectiveness of loading in controlling the uplift of the subway structure was evaluated,including load intensity,uneven loading,loading time,and step loading.The results indicate that the maximum uplift deformation of the subway structure caused by the excavation on both sides occurs near the connection between the subway station and the tunnel.The uplift of the subway structure decreases with increasing load intensity.Settlement can occur in some tunnel sections once the load intensity surpasses a certain threshold.Loading has a better control effect on deformation of the uplift of the tunnel compared to that of subway station,but the safety of tunnel deformation caused by loading needs to be evaluated in advance.The deformation constraint on adjacent tunnels weakens as the excavation depth increases,resulting in greater deformations caused by the same loading.Uneven loading can accurately control the deformation of the subway structure and effectively mitigate differential deformations between subway structures.Nevertheless,compared to uniform loading,it is necessary to appropriately increase the maximum load intensity.With the total load intensity remaining constant,the methods of preloading and step loading can be more effective in controlling the uplift deformation of the subway structure.Based on these findings,several construction recommendations were proposed.The proposed construction recommendations can provide a reference and guidance for the uplift deformation control of subway structures in the future.关键词
地铁结构/基坑开挖/隆起变形/堆载/控制措施Key words
subway structure/foundation pit excavation/uplift/loading/control分类
建筑与水利引用本文复制引用
邓旭,甄洁,林森斌,裴鸿斌,黄军华,李晨恺,高深,程雪松..基坑开挖引起地铁结构隆起的堆载控制研究[J].铁道科学与工程学报,2024,21(6):2417-2429,13.基金项目
国家自然科学基金资助项目(52178343) （52178343）
