钢板桩围堰在不同施工工序下的变形及内力特性研究

为比较钢板桩围堰在2种工序下的变形及内力不同特性，分别建立采用2种工序施工的三维有限元模型进行计算，并结合监测数据分析不同工序下钢板桩的变形及内力及其分布、发展规律，结果表明，改进施工工序下钢板桩围堰的变形及弯矩较常规工序大为减小，且能发挥较强的整体协调作用，在提高工程安全度、拓展钢板桩围堰的应用深度等方面优势突出；同时，采用改进工序钢板桩围堰也表现出更强的三维特征，其受力变形特点与常规工序下有所不同，甚至出现一些有违常规设计规律的最危险控制点，应在其设计及工程应用中加以注意。

RESEARCH ON DEFORMATION AND INTERNAL FORCE CHARACTERISTICS OF STEEL SHEET PILE COFFERDAM UNDER DIFFERENT CONSTRUCTION PROCEDURES

The three-dimensional finite element models for two construction procedures were established separately for making comparisons on deformation and internal force characteristics between different construction procedures；then deformation and internal force of steel sheet pile on the two construction procedures were analyzed and compared with the monitoring values. It has been found that deformation and bending moment were greatly reduced on improved construction procedure that could play a strong role in coordination，improving safety and expanding application range of steel sheet pile cofferdam. At the same time，it was also shown that characteristics of deformation and internal force on improved construction procedure were different with conventional construction procedure owing to its outstanding three-dimensional feature；and some dangerous zone ignored regularly should be noticed extremely in design and construction.