基于有限元模型的地连墙钢支撑预加轴力研究

Research on Preloading Axial Force on Steel Support of Ground Connecting Wall Based on Finite Element Model

针对深圳地铁某深基坑项目,采用Adina有限元软件进行三维建模,根据土层参数和地质勘探报告中的数据,将不同的土层属性分配给模型中的各个区域,根据施工进度对深基坑地连墙的钢支撑施加不同的预压轴力进行分析。当钢支撑预加轴力为0时,墙体水平变形量最大可达8mm。当施加100%的钢支撑预加轴力后,墙体水平变形量最小。预加轴力达到51%的钢支撑预加轴力后,桥墩的位移被控制在允许范围内。结果表明,适当增加预加轴力可以有效地控制结构位移,保证深基坑的稳定性。

For a deep foundation pit project in Shenzhen Metro,the finite element software Adina was used to conduct three-dimensional modeling.According to soil parameters and data in the geological exploration report,different soil properties were assigned to each area in the model,and different precompression axial forces were applied to the steel support of the foundation pit wall according to the construction progress.When the pre-axial force of the steel support is 0,the maximum horizontal deformation of the wall can reach 8mm.When 100% steel support is applied,the horizontal deformation of the wall is minimal.The displacement of the pier is controlled within the allowable range when the preloading of the steel support reaches 51%.The results show that the structure displacement can be controlled effectively and the stability of deep foundation pit can be ensured by increasing the preloading axial force appropriately.