桥头台背路堤与桥台设计方案评价

Evaluation of design schemes for embankment and abutment in bridge head

为了研究桥头路堤不均匀沉降,分析了桥头台背地基、地面与路堤的变形所产生的影响,研究了轻型桥台耳墙、牛腿、伸缩缝、桥头塔板的结构设计功能,并对设计方案进行了改进和完善。结果表明:在台背10 m范围内对地基进行处治,可明显减少路堤工后沉降;取消耳墙、牛腿的桥台结构方案,可以扩大台背压实工作面,有效提高压实度;建立的搭板变位模型可预测台背路堤工后沉降引起的搭板刚性支承端变位量。

To study the different settlements at bridge head, this paper analyzes the distortion function of abutment back subgrade, ground and embankment in bridge head, studies the design function of side wall, bracket, expansion joint and slab of light bridge head to improve the design scheme. The results show that： the settlement of embankment can be reduce obviously when the subgrade in 10 m from abutment is treated; the abutment design plan without wing wall and bracket can expand the working field of abutment back compaction to increase the compaction degree; the establishment of slab displacement model can forecast the displacement of slab end with rigid support. 1 tab, 4 figs, 5 refs.