基于弹性半空间地基模型的冲刷对桥墩稳定性的影响分析

Analysis of Scour’s Influence on the Stability of Piers Based on Elastic Semi-Space Soil Model

围绕着湘黔铁路线上的资水大桥受冲刷后的稳定性展开研究,从基底被冲刷淘空后引起的墩台地基不均匀沉降入手,应用弹性半空间地基模型和Matlab编制的计算程序分析计算了基底不同冲刷淘空面积对桥墩墩顶弹性水平位移和基底压应力的影响,从而得到了在不同冲刷程度下桥梁的整体稳定情况。根据计算结果,用最小二乘曲线拟合法找出了影响曲线表达式并绘出了图形。此外,还将该方法分析计算得到的数据与有限元方法分析得到的数据进行了比较,两种分析方法所得的结论相互验证。

The stability of Zishui Bridge after being scoured on the railway between Guizhou and Hunan was studied. It started from the uneven subsidence of piers and abutments＇ foundation caused by scouring the base to empty ; the elastic semi-space soil model and the program written by Matlab were applied to analyze and calculate the effect on the elastic horizontal displacement on the top of piers and the compressive stress on the foundation caused by different scour areas on the piers, and accordingly it got hold of the entire stability of the bridge with different extent to scour. On the basis of the resuits, the influence curve＇ s expression was found out by least squares curve fitting method and the graph was also drawn. Moreover, compared with the results got from the finite element analysis, it was found that the two results were compatible.