Research On The Treatment Of Abutment Jump Problem Using Reinforced Fly Ash

Abutment jump is one of the most frequent quality problems encountered in highway construction. A lot of money was used to mend it every year. In order to look for an economical and reasonable treatment for it, the causes of abutment jump were studied in this paper. It is understood that the unequal settlement between abutment and approach embankment is the main cause of abutment jump. Combined with composite usage of industrial slag, a treat method wasput forward that use lightweight material------reinforced mixture of high calcium fly ash and flyash to backfill the approach embankment. Which can reduce the approach deadweight and ground additional stress. Together with soft ground stabilization, to reduce ground settlement and the compression of backfill material. So that eliminate the unequal settlement between bridge abutment and the approach embankment. Avoid abutment jump.In according to systemic experiment research on the characteristic of high calcium fly ash, fly ash and its mixture, on the performance of reinforced fly ash, on the research of model test indoors. This paper proposed the optimized mixing design for high calcium fly ash and fly ash mixture, determined its technical parameter for road application, put forward the loosening coefficient of fly ash mixture and analyzed various factors that may influence these properties, discussed the design and construction techniques. It is provided that the scientific basis for the popularization application of this method.In the light of relative knowledge of other technicians. A settlement calculating formula of reinforced fly ash embankment was derived. Combined with a real project of the bridge approach embankment of Beijing Recipient River in Jiuyuan highway, the real project test was done, and the settlement compared results of calculating result and observed result were provided. It was tested in practice that the effects of the treatment method for abutment jump using reinforced fly ash. It is proved that the unequal settlement can be reduced effectively through the method of backfill the approach embankment using reinforced fly ash. So as to avoid abutment jump. A new and feasible method to cure abutment jump was provided.