郑州某地铁站基坑围护桩变形监测与数值分析

Deformation Monitoring and Numerical Analysis of Foundation Pit of a Subway Station in Zhengzhou

地铁作为城市中的重要交通工具,其安全重要性不言而喻。在地铁施工过程中,基坑的围护结构特别重要。论文以郑州市某地铁站基坑工程为研究对象,通过对基坑开挖过程中的围护结构桩体水平位移的监测值与有限元ABAQUS的模拟值进行比较,发现现场的实测值略大于有限元的模拟值,但两者曲线的变化趋势基本上一致,都在基坑深度的中点附近处达到最大值,呈现"鱼腹式"且都小于方案上规定的安全警戒值。这就说明,该基坑采用的围护结构是安全合理的,模拟结果可以为类似的工程提供理论上的参考。

As an important means of transportation in a city, subway safety is of great importance. In the subway construction ,the retailing structure of the foundation is very important. Based on the excavation of a subway station in Zhengzhou city, the measured values of the horizontal displacement of the retaining structure in the excavation process of the foundation pit were compared with the simulated values of the finite element ABAQUS, and the actual measured values were found by comparison that it is slightly larger than the simulation value of the finite element, but the trend of the two curves is basically the same. Both of them reach the maximum value at the depth of the foundation pit, present a ＂fish belly type＂ and are all smaller than the safety warning value specified on the plan. This shows that the enclosure used in the foundation pit is safe and reasonable, and the simulation results can provide a theoretical reference for similar projects.