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针对软土地基某一桥梁偏位工程,通过数值计算结果与现场实测数据的对比分析,了解邻近不对称堆载对桥梁桩基偏位及内力的影响,并对桩基加固方案中桩基变形及内力进行探讨。通过分析结果可知,在不对称堆载作用下,桥梁墩柱及基桩将发生侧向偏位,尤其是当不对称堆载的作用较大时,基桩将发生较大的位移,并在桩身产生较大的弯矩,这可能导致基桩桩身产生开裂破坏而影响后续桥梁的安全使用。在补桩加固后,墩基的抗侧移刚度有了较大提高,但随着堆土高度的增大时,墩柱仍将发生较为显著的位移,故在补桩加固后仍有必要对桩周土体的不对称堆载进行限制。同时,在相同堆载作用下,补桩基桩与原有基桩所产生弯矩分布存在较大的差异,尤其是弯矩最大值的分布位置发生明显变化,在后期补桩加固设计应予以考虑。
Aiming at the deflection project of a bridge on soft soil foundation, the influence of adjacent asymmetrical pile loading on the deflection and internal force of bridge pile foundation is analyzed by comparing the numerical results with the field measured data. And the pile foundation deformation And internal forces to explore. Through the analysis of the results, it can be seen that under the asymmetric loading, the lateral displacement of the bridge pier and the pile will occur. Especially when the asymmetric loading is large, the displacement of the pile will be larger. The pile body produces a large bending moment, which may cause cracking of the pile foundation to affect the safe use of subsequent bridges. After the reinforcement of stubble pile, the lateral stiffness of pier foundation has been greatly improved. However, with the increase of stubble height, the pier column will still have more significant displacement, so it is still necessary to reinforce the stubble Asymmetric pile of soil around the pile limit. At the same time, under the same loading, there is a big difference between the bending moment distribution of the pile and the original pile, especially the distribution of the maximum bending moment has changed obviously. consider.