Research on differential settlement of soft soil roadbed and bridge transition section in expressway
This paper takes the soft soil subgrade bridge transition section of a certain highway in Shandong province as the research object.Based on Midas finite element software,the variation law of settlement before and after the treatment of the soft soil subgrade bridge transition section is analyzed,and the effect of backfill materials and high-pressure rotary jet grouting piles on settlement control of the soft soil subgrade bridge transition section is studied.Finally,the influence of the position and size parameters of high-pressure rotary jet grouting piles on settlement is discussed.The research results show that without treatment,the settlement deformation curve of the filling area shows a"V"shape,and the settlement first increases and then decreases.When the distance from the back of the bridge abutment is 4.5 meters,the settlement reaches the maximum value of 0.11 meters.As the distance from the center line of the roadbed increases,the surface settlement of the roadbed decreases continuously.The replacement method gradually increases the distance between the maximum settlement of the filling area and the back of the bridge abutment,and the replacement effect gradually weakens with the increase of stiffness.Moreover,when the stiffness of the filling increases by 5 times,the settlement of the filling area is generally smaller than that of the soft soil area.The settlement control effect of the jet grouting method is relatively stable,and the settlement decreases continuously with the increase of pile length.When the pile spacing increases from 1 m to 1.5 m,the maximum settlement in the filling area of the 5 m pile length increases by 25％.
road and bridge transition sectionnumerical simulationsoft soil subgradedifferential settlementsettlement control measures
万方数据
维普
