锚索+SMW工法深基坑变形特性流-固耦合研究

The Deformation Characteristics with Seepage-consolidation Coupling Research for Deep Foundation Excavation by Anchor Cables+SMW Method

锚索+SMW工法是软土深基坑的一种新型支护形式,具有广阔的应用前景。为了深入研究该支护形式的工作性状,以济南市某深基坑工程为例,考虑降水对基坑安全的不利影响,应用多物理场耦合软件COMSOL Multiphysics,采用稳定渗流场-应力场耦合的方法,建立二维有限元数值模型,系统地研究了基坑内坑底隆起量、基坑外地表沉降量及SMW工法桩的水平位移量等基坑变形特征。计算结果与工程实际监测数据吻合良好,很好地反映了基坑及周边建筑物的实际变形情况。研究成果对于深入认识锚索+SMW工法作用机理、促进其在软土深基坑中的工程应用具有重要意义。

The anchor cables+SMW method is a new support type for deep foundation excavation in soft soil area,which has wide application prospects.In order to further study the work traits of the support type,a deep foundation excavation project in Ji’nan was taken as an example.Considering the unfavorable influence of precipitation in the excavation,using COMSOL Multiphysics software and the method of stable seepage-consolidation coupling established a two-dimensional finite element numerical model and researched the deformation characteristics of the foundation excavation systematically such as the bottom apophysis in the foundation excavation,the surface settlement outside the excavation,and the horizontal displacement of the SMW.The calculated results coincide with the actual monitoring data of the project,which reflects the actual deformation of the foundation excavation and the surrounding buildings well.The research results are of significance for the further understanding of the mechanism of the anchor cables+SMW method and its application of the deep foundation excavation in soft soil areas.