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首先对基坑支撑结构的稳定性进行了验算,通过对地铁车站基坑实测数据的分析,探讨了基坑围护结构位移,钢支撑轴力及地表沉降的变形特性。结果表明:该工程基坑的标准段钢支撑结构满足稳定性要求;基坑围护结构水平位移为基坑开挖深度的0.02%～0.06%。围护结构的变形特性是中间大两头小,表现为深层凸鼓形;轴力表现为开始阶段持续地增长,之后趋于稳定,并微量波动;地表沉降随着开挖深度的增加不断增加,后期变形量显著降低,趋于稳定;围护结构的水平位移和地表沉降的分布均具有相似的空间效应:基坑边角处变形较小,随后逐步增大,至基坑中部达到最大值。
Firstly, the stability of the foundation pit supporting structure was checked. Based on the measured data of the foundation pit of the subway station, the deformation characteristics of the retaining structure of foundation pit, the axial force of steel support and the settlement of the ground surface were discussed. The results show that the standard section steel support structure of foundation pit satisfies the stability requirements. The horizontal displacement of retaining structure of foundation pit is 0.02% ~ 0.06% of the excavation depth of foundation pit. The deformation characteristics of the retaining structure are small in the middle and small in the middle, showing a deep convex drum shape. The axial force shows a continuous increase in the initial stage, then tends to be stable and fluctuates slightly. The surface subsidence increases with the increase of the excavation depth, The late deformation decreased and stabilized. The horizontal displacement and the surface subsidence distribution of the retaining structure both had similar spatial effects: the deformation at the corners of foundation pit was small and then gradually increased to reach the maximum in the middle of the foundation pit.