液态粉煤灰填筑桥头路堤的应用研究

Study on Application of Liquid Flyash Fill in Bridge-approach Embankment

桥头与台背填料间的不均匀沉降引起的桥头跳车和填料对台背的水平推力引起的桥台倾覆问题,一直是公路工程中的难点。以唐津高速公路在天津地区的试验段为例,采用液态粉煤灰填筑桥头台背路堤。研究结果表明:轻质型材料液态粉煤灰具有强度大、质量轻、不需要机械压实等优点,且对桥头台背的压力小,与台背间的不均匀沉降也小,是较好的桥头路堤填筑材料。

Vehicle bump arising out of uneven settlement between bridge head and abutment fill, and abutment overturning arising out of the horizontal thrust applied by the fill on abutment, are always the difficulties in highway engineering. In the test section of Tangshan-Tianjin Highway in Tianjin region,liquid flyash was used to fill the bridge-approach embankment. The study result shows that the lightweight material of liquid flyash is the good filling material for bridge-approach embankment,which comes from its advantages of high strength,light weight and free from mechanical compaction,and is demonstrated by small pressure on the abutment and small uneven settlement against the abutment.