Bridge road transition section roadbed structure of deep layer yielding ground regions

Abstract

The invention discloses a bridge road transition section roadbed structure of deep layer yielding ground regions. The bridge road transition section roadbed structure of deep layer yielding ground regions comprises a settlement and rigidity smooth transition system, a bearing force control system and a conventional foundation stabilizing system; the conventional foundation stabilizing system is positioned at one side of a roadbed body; the settlement and rigidity smooth transition system and the bearing force control system are positioned between the conventional foundation stabilizing system and a bridge abutment; the settlement and rigidity smooth transition system comprises a raft below a track and a plurality of long piles entering the roadbed; the long piles lengthen gradually from the pavement to the bridge abutment direction; the pile top parts of the long piles enter the raft, and the long piles and the raft are in rigid connection into an integral structure; the bearing force control system comprises a plurality of short piles arranged below the roadbed; the pile top parts of the short piles are provided with first broken stone hardcores for bearing the roadbed, and the long piles penetrate through the first broken stone hardcores.

Description

technical field [0001] The invention relates to the field of high-speed railway embankment engineering, in particular to an embankment structure of a bridge-road transition section in an area with deep and thick soft soil. Background technique [0002] High-speed railway is one of the main development directions of the world's railways. The space span of high-speed railway is large, and different structures such as bridges and roadbeds need to be set up according to the terrain and geological conditions along the line. When a high-speed train passes through the junction of different structures, due to Differences in stiffness and settlement deformation often lead to severe vibration of the train, which affects the comfort and safety of driving. In order to ensure the safe and smooth running of high-speed trains, it is necessary to set a certain length of transition section between bridges and roadbeds and other structures, so that the stiffness of the line changes gradually,...

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Problems solved by technology

[0003] Chinese patent CN201390925Y discloses a "high-speed railway bridge transition subgrade structure", which strengthens the embankment by setting a wedge-shaped reinforcement transition section on the subgrade connected to the abutment, and setting a reinforced concrete slab connected to the abutment on the subgrade surface The stiffness of the filling body makes the stiffness of the bridge and the subgrade coordinated. This structure does not consider the influence of the foundation conditions. For soft soil or other foundation types with large settlement deformation, it is impossible to achieve a smooth transition of the stiffness of the bridge-road transition section; Chinese patent CN201530961U Disclosed is a "structure of anti-seismic road-bridge transition section of liquefied soil foundation for ballastless track of high-speed railway", which adopts a wedge-shaped reinforced graded gravel transition section between the abutment and the roadbed, and reinforcements arranged in the non-liquefied soil layer The piles realize the uniform transition of the longitudinal stiffness of the line. The reinforcement piles in this structural form are all set on the foundation surface. For deep and thick soft soil foundations and subgrade structures with high fill and wide subgrade surface, the cost of foundation treatment is very expensive.

In addition, neither of the two structural forms can avoid the deformation of the transition section caused by the quality defect of embankment filling

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