堆载滑动对桥墩与桩基础的影响分析

The Impact Analysis of Surcharge Load Sliding Influence on the Bridge Pier and Pile Foundation

针对处于陡坡地段的某公路大桥桥梁桩基偏位问题,通过数值计算结果与现场实测偏位值的对比分析,用位移法计算得到堆载滑动前后桥梁桩基的侧向偏位与内力(弯矩和剪力)分布情况,并提出了合理的治理措施。研究结果表明,堆载滑动是影响桥梁安全性的主要因素,滑动后桥墩偏位和内力显著增加;堆载大小对桩身偏位和内力分布影响较大,位移和内力随堆载增加而增大且呈非线性增大;桩基在系梁处存在受力不利区域,桩身内力均在系梁处发生较大突变;实际中,应避免对桥梁桩基的大面积堆载,以免堆载滑动对桥梁产生破坏。

Based on a highway bridge project at the steep slope section of which the deflection of the pier and pile are caused by the load sliding, through the comparative analysis of the results of numerical calculation and field measurement, the lateral displacement around bridge pile foundation and the internal force （ the bending moment and the shear force） distribution with the reasonable measures are carried out using displacement method. The load sliding is the main factor influencing the safety of bridges according to the results, significantly displacement and internal force of piers increased after sliding ; the lateral displacement and internal force are increased nonlinearly with increasing loading when the magnitude of stack influ- encing deviation and internal force distribution of pile body; department of pile foundation near the beam where the bending moment and shear force are larger sahation appears adverse stress area. Consequently, it＇s necessary to avoid the large stack of bridge pile foundation to reduce bridge damages.