福州某软土地区深基坑开挖对周围建筑物影响的三维有限元分析

摘要

In this paper,the ABAQUS software and secondary development of nonlinear elastic Duncan -Chang’s model were used to establish the whole 3D finite element model of soft soils under excavation in Fuzhou city using 3D solid elements,shell elements and beam elements which considered contact interaction.The Dun-can -Chang constitutive model parameters attained by K0 consolidation sample were applied to simulate the con-struction process of excavation using total stress analysis method.It shows that the spatial effect of excavation en-gineering is evident and the estimated results of this model are in good agreement with the field measurements. But the calculation solutions with m method which is suggested by the current technical code cannot match exact-ly.Then the influence of the excavation on surrounding buildings is analyzed with the 3D finite element model. Therefore,it can reveal the influence law and provide theoretical basis to the supporting design of the surrounding buildings under excavation.%运用 ABAQUS 软件和二次开发的非线性弹性邓肯－张模型按照三维实体单元、壳单元、梁单元考虑接触相互作用的耦合有限元法，建立福州一典型软土基坑工程整体三维有限元分析模型，采用室内 K0固结试样的邓肯－张参数，按总应力分析法对基坑开挖施工过程进行了数值模拟，研究结果表明：基坑的空间效应明显，较之规范建议“m”法，与现场实测值吻合良好。在此基础上，将基坑开挖施工可能影响到的周边建（构）筑物体现于模型中，则可较好地揭示基坑开挖可能对其造成的影响，为保护周边建（构）筑物的支护方案设计提供理论依据。