改进的杆系有限元在预应力锚杆柔性支护法中应用  

Application of modified beam-spring FEM to prestressed anchor flexible retaining wall

作　　者：贾金青[1] 陈国周[1] 孟祥波[2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室/结构研究所,大连116024 [2]鲁东大学交通学院,山东烟台264025

出　　处：《岩土力学》2007年第11期2314-2318,共5页Rock and Soil Mechanics

基　　金：建设部软科学研究项目(No.05-K1-25)

摘　　要：现在基坑设计中常用的杆系有限元计算方法是基于桩墙和锚杆联合支护的,不适用于预应力锚杆柔性支护。根据预应力锚杆柔性支护法的施工特点,改进了杆系有限元计算模型,提出柔性支护的开挖荷载计算方法,使之可以适用于预应力锚杆柔性支护法。编制了相应的计算程序,最后对一个实际工程进行计算分析,结果表明,用改进后的杆系有限元方法可以计算出预应力锚杆柔性支护的基坑水平位移、锚杆轴力,计算值与实测值较为吻合。The conventional beam-spring FEM used in deep excavation retaining design is based on anchored pile or anchored diaphragm retaining; and it is not fit for prestressed anchor flexible retaining wall. Based on the construction characteristics of prestressed anchor flexible retaining wall, the beam-spring FEM is modified. A new technique to evaluate the excavating load for flexible retaining is given; and a new beam-spring FEM program is developed correspondingly. Lastly a practical engineering project is analyzed using the new beam-spring FEM code. The horizontal displacement of retaining wall and the axial force of each anchor are yielded and compared with the field data; and it is shown that the new beam-spring FEM suits prestressed anchor flexible retaining wall.

关 键 词：深基坑开挖 预应力锚杆柔性支护法 数值模拟 杆系有限元 

分 类 号：TU443[建筑科学—岩土工程]