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根据某桥梁特大圆形锚碇基坑实测数据,建立了有限元分析模型,对比了该圆形锚碇基坑的结构效应,结果表明:支护结构的水平位移沿深度方向呈明显的“大肚”形;环形内衬支护体系对基坑变形有较好的“自控制”;圆结构促使部分径向荷载转化为环向荷载,环向结构应力均远大于径向结构应力,圆形基坑“结构拱效应”作用明显。
According to the measured data of extra large circular anchorage foundation pit of a bridge, the finite element analysis model is established and the structural effect of the foundation pit with circular anchorage is contrasted. The results show that the horizontal displacement of support structure is obviously “ Big belly ”shape; annular lining support system has a better “ self-control ”for the deformation of the foundation pit; the circular structure causes part of the radial load to be converted into a hoop load, the hoop structure stress is far greater than the radial structure Stress, circular foundation pit “structural arch effect ” effect is obvious.