深基坑中大型环梁支护体系的有限元分析

The application of ANSYS simulation of ex-cavation to a large ring beam supporting system

采用有限元分析软件AN SY S对某医院肿瘤中心深基坑工程的环梁支护体系进行三维非线性有限元模拟,土体模型采用了弹塑性的D-P材料模型,同时考虑围护结构与土体的相互作用。分析时把土体、围护桩和水平环梁支撑系统看成一个空间三维整体,在分步开挖的工况下计算基坑及其支护结构的变形情况。通过与现场实测数据的对比分析表明,利用AN SY S分析模型进行环梁支护体系模拟分析是可行的,值得在工程中推广。

The nonlinear finite element software ANSYS is adopted to simulate the annular beam bracing in the case of deep foundation pit project carried out in the tumor center of a hospital with elastic-plastic D-P used as the model while the interaction between soil and bracing structure is taken into consideration. Based on the consideration of soil, piles and horizontal ring beam bracing structures as a 3D whole, the distortion data of excavation and its supporting structure at stepexcavating are analyzed. Based on the comparative analysis of measured data, it is proved that simulation analysis works well and is worth being popularized.