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武汉鹦鹉洲长江大桥主桥为3塔4跨悬索桥,其北锚碇采用圆形沉井形式,施工前在周围预先制作圆形地下连续墙。考虑到沉井下沉对邻近建筑物和构筑物的影响,根据沉井施工工况,结合现场实测监控数据,采用MIDAS-GTS建立三维计算模型进行有限元分析,主要讨论三维计算模型所得关键测点的位移值与实际测量值的吻合情况,在指导现阶段施工的同时,预测后续工况对周围建筑及长江大堤的影响,同时先后分析沉井下沉过程对圆形地下连续墙变形的影响。计算结果表明,关键测点的变形计算值与实测值结果比较吻合,计算误差基本在5%~30%,施工可有效地避免对周围建筑物和长江大堤不利影响;地下连续墙变形会随沉井下沉而增大,但收敛趋势明显。该计算模型对沉井下沉的姿态控制具有参考价值。
The main bridge of the Wuhan Parrot Island Yangtze River Bridge is a 3-tower 4-span suspension bridge. The northern anchorage adopts the round caisson form. Before the construction, a circular underground continuous wall is prefabricated. Considering the influence of caisson sinking on the adjacent buildings and structures, according to the caisson construction conditions and field monitoring data, the three-dimensional calculation model was established by MIDAS-GTS for finite element analysis. The key points of the three-dimensional calculation model were discussed In the meantime, the influence of subsequent conditions on the surrounding buildings and the Yangtze River dike is predicted. At the same time, the influence of the sinkhole sinking process on the deformation of the circular diaphragm wall is analyzed. The calculated results show that the calculated values of the key measuring points are in good agreement with the measured ones and the calculation errors are basically between 5% and 30%. The construction can effectively avoid the adverse effects on the surrounding buildings and the Yangtze River dyke. Downhole sink and increase, but significant convergence trend. The calculation model has reference value for the attitude control of sunk subsidence.