钢板桩围堰力学性能影响因素研究

Study on Mechanical Property Influencing Factors of Steel Sheet Pile Cofferdam

为掌握不同因素对钢板桩围堰力学性能影响,以东江大桥承台钢板桩围堰施工工程为依托,基于MidasGTS软件建立三维有限元模型,分析逐层抽水并安装内支撑(传统工序)和预先安装所有内支撑再进行抽水(改进工序)2种工序下位移和弯矩的变化规律,并研究钢板桩外侧水位变化对最大位移和最大弯矩的影响。结果表明:传统工序和改进工序下钢板桩位移和弯矩均随抽水深度的增加而增加,但传统工序的位移和弯矩主要发生在第1次抽水阶段;采用改进工序施工时钢板桩位移和弯矩较传统工序明显下降;传统工序和改进工序下钢板桩最大位移和最大弯矩均随外侧水位的升高而增加,且二者对水位高度变化的敏感性随水位高度的升高而增强。

For understanding the effect of different factors on mechanical property of steel sheet pile cofferdam,Dongjiang Bridge Cap Steel Sheet Pile Cofferdam Construction Project is the support,build three-dimensional finite element model based on Midas GTS,so analyze Lower displacement and bending moment variation with pumping layer by layer and installing internal support(traditional process)and pre-installing all internal supports and then pumping(improving process).The result shows that steel sheet pile displacement and bending moment both increase with pumping depth increasing under traditional and improved process,but the traditional displacement and bending moment was mainly occurred in the first pumping stage;the improved displacement and bending moment are both sharply declined;under both processes,maximum displacement and maximum moment both increased with outside water level rising,and both the sensibility to water level increases with water level rising.