陡坡地段桥梁桩基的施工监测和有限元分析

通过对某高速公路建造在陡坡地段的桥梁桩基从施工到通车全阶段开展监测,分析了在施工荷载作用下桥梁桩基和陡坡土体的位移分布和变化规律。然后利用弹塑性有限元模型,分析了桩身位移的分布规律,并与监测结果进行了比较,得出有限元模型能较好地模拟桩土之间的相互作用;还分析了坡顶荷载和桩身最大弯矩之间的关系,提出了临界施工荷载对控制桥梁桩基稳定性的重要意义。

Construction Monitoring and FEM Analyses of Bridge Pile Bottom Constructed in Steep Slopes

Through the bridge pile bottom constructed in steep slope of a certain expressway are monitored at the full stage from construction to opening traffic,the displacement distribution and change law of bridge pile bottom and slope soil under construction load are analyzed. The distribution law of body pile displacement is analyzed by elastic-plastic FEM model and the analytical results are compared with the field monitoring results. The results show that the FEM model can simulate pile-soil interaction better.The realationship between load of slope crest and maximum moment of body pile is also analyzed.The importance of critical construction load to control the stability of bridge pile bottom is presented.