基于有限元的支架下填土沉降分析

郑州黄河公铁两用桥铁路引桥南岸跨大堤拱桥为先梁后拱的施工方法，大堤两侧高填土搭设主梁支架．由于高填土在长期的荷载作用下可能会产生比较大的沉降，会对主梁线形及拱桥的受力产生不利影响，故基于渗流固结理论对填土沉降进行计算，确定出了沉降-时间关系曲线，并通过具有强大非线性分析功能的有限元计算软件ADINA对计算结果进行复核．结果表明，此界定条件下的填土在施工阶段沉降较小，施工过程中可不予考虑其影响，或在主梁浇筑前适当调高主梁立模标高．

Settlement Analysis of the Soil Under Scaffold Based on Finite Element Method

The construction of arc bridge spanning the dike at the south bank of the bridge approach of Zhengzhou Yellow River Railway-highway bridge was used the method of first constructing beams then arc, high filling soil on the both side of the dike was used to put up the stands of the main beams. Big settlement would be come into being because of long time effect of high filling soil,these would have bad effect on the main beams＇ line and the bearing capacity of the arc bridge. So, based on Seepage Consolidation theory, the settlement of soil filled was calculated,the relation curve between settlemend and time was determined,the calculative result was tested by a powerful nonlinear analytic software ADINA. The results show that the settlement during filling soil construction is little under this definition condition, and the effect of this settlement can not be considered during the construction, or the level of erect mould is adjusted to a suitable height before pouring the main beams.