Research on the Stress-Strain Law of Abutment Approach Embankment Filled with Liquid Fly Ash

Abstract

Because of the narrow condition of bridge approach embankment, the large compacting machines can not use in the embankment construction. The differential settlement between abutment and approach embankment was easy to produce. Coupled with the the structural differences of the abutment and embankment, how to ensure abutment stable and prevent bridge head bump has been an engineering roadblock in the abutment approach embankment filling engineering. The key factor to solve the problem of the roadblock is reducing the horizontal thrust of embankment on abutment and the difference in settlement between road and bridge. Test results showed that liquid fly ash is a new lightweight value material of self-compacting, which has higher strength, stiffness and smaller density. Using liquid fly ash as the bridge-approach embankment filling material can effectively reduce the horizontal thrust of embankment on abutment and decrease its own settlement deformation. ANSYS computational analysis showed that when we use liquid fly ash filling the bridge approach embankment, the horizontal thrust of the same position will increase with the increase of the filling height, and the value is lesser than the horizontal thrust of soil filling subgrade. Pavement settlement increases with the filling height increasing, but it is significantly less than the general soil filling subgrade.