Waste tire rubber powder modified composite foundation bed structure based on high-speed rail roadbed strengthening layer

Abstract

The invention discloses a waste tire rubber powder modified composite foundation bed structure based on a high-speed railway roadbed strengthening layer, which comprises a strengthening layer and a modified water stable layer, the corresponding surfaces of the strengthening layer and the modified water stable layer are combined together, a track is arranged on the strengthening layer, the modified water stable layer is positioned on a foundation bed bottom layer, and the foundation bed bottom layer is positioned on the upper part of a roadbed. The waste tire rubber powder modified composite foundation bed surface layer structure is jointly formed by the modified water stabilizing layer and the reinforcing layer, the waterproof function and the freeze-thaw cycle damage resistance are achieved, the occurrence degree of frost heaving and thaw collapse deformation diseases is weakened, and the fatigue performance of the material is improved; the rigidity performance of the material is adjustable and controllable, the problem of stress concentration caused by sudden modulus change of a roadbed structure layer can be relieved, the stress state of an interlayer structure can be improved, and the overall stability of the roadbed structure can be improved by improving the interlayer shear strength. The method is suitable for the technical field of high-speed railway roadbed engineering.

Description

technical field [0001] The invention belongs to the technical field of high-speed railway subgrade engineering, and in particular relates to a waste tire rubber powder modified composite bed structure based on a high-speed railway subgrade reinforcement layer. Background technique [0002] The accumulation, incineration or landfill of waste tires will not only occupy a lot of land resources, but also cause serious pollution to the environment. Therefore, the recycling of waste tires has its practical urgency. The surface structure of the subgrade bed of high-speed railway often adopts a layered structure system strengthened by graded crushed stone, and its obvious material characteristics include a small amount of fine-grained soil and continuous gradation. Due to the poor water stability of fine-grained soil, under the combined action of train dynamic load and atmospheric precipitation, it is easy to produce diseases such as mud and mud, and the vicious circle of diseases ...

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Problems solved by technology

At the same time, due to the low stiffness of the subgrade, a sudden change in modulus is formed between the surface layer of the subgrade bed with a higher modulus, and the deformation between layers is uncoordinated, which is extremely unfavorable to the stress state of the bottom surface of the cement-stabilized gravel base and is prone to stress concentration question

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