钢支撑在天津某地铁深基坑中的稳定性研究

Study on the Stability of Steel Supports in Deep Foundation Excavation for Tianjin Subway

基坑稳定性对于地铁工程的顺利完成有很大作用,而钢支撑轴力的变化可以反映基坑中土压力的变化,这得益于钢支撑结构受力明确。通过对天津某地铁车站明挖深基坑工程钢支撑轴力的监测资料进行分析,得出基坑开挖过程中各层钢支撑轴力的变化规律,对于分析基坑稳定性具有重要意义。同时,运用有限元软件MIDAS/GTS对基坑开挖施工阶段进行模拟分析,得出基坑在不同开挖阶段钢支撑轴力云图,并与实际施工阶段较为接近。

The stability of foundation excavation is contributed to the competition of subway project successfully,and the change of soil pressure of foundation excavation can be reflected by the change of steel support axial forces,which benefits from the clear stress of the steel support structures. Through analyzing the monitoring data of deep foundation excavation steel shotcrete axial force for the station of Tianjin subway,the variation rule of steel shotcrete axial forces of each layer is obtained during the excavation process,which is of great significance for the stability analysis of foundation excavation. At the same time,foundation excavation construction is simulated and analyzed by finite element analysis software MIDAS / GTS,and the axial force nephograms of steel supports in different excavation stages are obtained,which is close to the actual construction stages.