改进的杆系有限元法在预应力锚杆复合土钉支护中的应用

Application of Improved Beam-spring FEM in Prestressed Anchor Composite Soil-nailed Wall

为合理计算分层支护结构的内力及位移,以预应力锚杆复合土钉墙为研究对象,考虑分步开挖的施工过程及预应力施加对支护结构内力及变形的影响,将规范中的杆系有限元法进行改进,使其适用于柔性结构,提出一个考虑结构与土体相互作用的土压力计算模型,并编写了相关程序。最后,将计算结果与工程实测数据进行对比,证明该方法计算柔性支护的水平位移及构件轴力较为合理。

To calculate reasonably internal force and displacement of retaining structures which are supported hierarchically,prestressed anchor composite soil-nailed wall is studied and some factors are considered including layered excavation as well as effect of prestressing on axial force and deformation.In the paper the beam-spring FEM in specification is improved and applied to flexible structures.An earth pressure calculation model is established considering interaction between structure and soil and correlative programs are worked out consequently.At last,calculation results are compared with tested data,and validity of proposed method is proved.