地铁深基坑支护结构位移动态预测

利用反分析和已有监测成果,用以弹性抗力为基础的杆系有限元法编制程序。分析计算深基坑的分层开挖和逐层支撑各工况下支护桩的内力与位移,预测各工况下支护桩体的水平位移。以深圳地铁罗湖站安全线深基坑为实例,预测20m和25m桩在不同工况下的水平位移。预测结果与实测结果吻合较好,按预测值对施工方案进行了优化。

The Dynamic Displacement Prediction for the Retaining Structure of the Deep Excavation Pit in Subway

Through using a finite element method on elastic resistance foundation, taking into account reversion analysis and monitoring data, a finite element analysis programme has been worked out. Analyzing and calculating the internal force and displacement of the retaining pile at the excavation of deep pit at each level under different condition, the horizontal displacement of the pile body is predicted. Taking the deep foundation pit of the safety siding at Luohu subway station in Shenzhen for example, the horizontal displacement of 20 m and 25 m pile under different condition is predicted. The predicted value better tallies with the field test value. The construction plan has been optimized according to predicted value.