Frozen soil variable stiffness road and bridge transition structure and construction process thereof

Abstract

The invention provides a frozen soil variable-stiffness road and bridge transition structure and a construction process thereof. The frozen soil variable-stiffness road and bridge transition structure comprises a bridge abutment and a roadbed. The roadbed comprises a graded broken stone hardcore, a reinforced concrete retaining wall, a block broken stone packing layer, a soil filling layer and a rigid butt strap. The reinforced concrete retaining wall is provided with a plurality of filling areas and connected with the bridge abutment. The block broken stone packing layers are arranged in the multiple filling areas, slopes are arranged on the sides, away from the graded broken stone hardcore, of the block broken stone packing layers, and the heights of the slopes are gradually decreased in the direction from the side close to the bridge abutment to the side away from the bridge abutment; the rigid transition slab is borne by the block gravel packing layer and connected with the bridge abutment. According to the variable-stiffness roadbed structure, the differential compaction settlement disease caused by sudden stiffness change of the roadbed under the long-term dynamic load effect is improved through the variable-stiffness roadbed design, the permafrost foundation is prevented from being melted through the cooling effect of the block gravel packing layer, and the durability of road engineering is improved while the problem of bump at the bridgehead is effectively solved.

Description

technical field [0001] The invention relates to the field of road and bridge construction, in particular to a road and bridge transition structure with variable stiffness in frozen soil and a construction process thereof. Background technique [0002] Permafrost is soil and rock that is below 0°C and contains part of the frozen water. The total area of ​​permafrost (seasonal frozen soil and permafrost) accounts for about 75% of my country's land area, and the construction of many roads, bridges and other infrastructure in permafrost areas has become an indispensable means of development. However, the properties of frozen soil are closely related to temperature changes, and its unfrozen water content will change with the change of external environment temperature. This characteristic determines that the mechanical and thermal properties of frozen soil are relatively dynamic and unstable. This will easily cause the roadbed of the road project to be unstable, which in turn wil...

AI Technical Summary

Problems solved by technology

[0004] It cannot meet the variable stiffness requirements and the stability of the subgrade in the transition section at the same time, and cannot protect the permafrost base

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