高填方大跨双孔钢波纹管涵测试与分析

摘要

为了解双孔钢波纹管涵应用于高填方路基时径向土压力及变形特性,结合依托工程,通过现场试验,并精细化有限元建模方法对其进行分析.结果表明,双孔2-φ5.5 m钢波纹管涵,变形与径向土压力随着填土高度的增加而增大,填土高度达到管顶24 m尚未出现明显土拱效应;径向土压力沿管周分布呈椭圆形,采用双孔管涵,结构受力与单管涵基本相同,最大径向土压力出现位置不同,位于管斜下方45°位置;有限元分析与试验结果相吻合,表明有限元分析模型精度满足工程要求.最后,将公路桥涵规范中土压力计算结果与有限元、测试结果进行对比,规范计算得到的最大土压力偏大,最小土压力偏小.%To explore the distribution of the radial earth pressure and deformation characteristics of two parallel corrugated steel pipe culverts under high backfills,a finite element(FE)analysis as well as a field test on this structure in engineering structure have been performed.The results show that the deformation and radial earth pressure of these two parallel corrugated steel pipes(2-φ5.5 m)increase with the increase of the depth of cover,and the soil arching effect is not obvious even when the depth of soil-cover reaches to 20 m;the distribution of radial earth pressure around the pipes shows an elliptical shape.It is also found that the static response of the two parallel pipes under high backfills is basically the same as that of the single pipe,except that the maximum radial earth pressure occurs in different positions.For the two pipes,it is located either southwest or southeast of the pipe cross sections.A good match is observed between the results of the FE analysis and the field test,which indicates that the FE model can satisfy the precision requirement of the design.In addition,different results derived from Genral Code for Design of Highway Bridge and Culvert,FE analysis and the field test data are also compared.It shows that,the magnitude of the maximum radial earth pressure from Code is the largest,while that of the minimum radial earth pressure from Code remains the smallest.