Expansive soil foundation structure containing ballastless track roadbed and construction method

Abstract

The invention provides an expansive soil foundation structure containing a ballastless track roadbed and a construction method. The structure comprises porous pipe piles, an expansive soil foundation,a geosynthetics reinforced cushion layer and a ballastless track roadbed, the porous pipe piles and the expansive soil foundation are arranged at the lowermost portion, and the geosynthetics reinforced cushion layer and the ballastless track roadbed are sequentially arranged above the porous pipe piles and the expansive soil foundation from bottom to top; a plurality of porous pipe piles are vertically arranged in the expansive soil foundation, each porous pipe pile comprises a hollow porous pile body and an elastomer material filling the hollow porous pile body, each hollow porous pile bodyis of a hollow reinforced concrete structure, and each porous pipe pile further comprises a radial through hole penetrating through the inner wall and the outer wall of the corresponding hollow porouspile body in the radial direction. According to the method, the expansion and shrinkage deformation of the expansive soil foundation during water immersion and loss is effectively reduced, so that the expansion and shrinkage deformation of the ballastless track roadbed is controlled within a reasonable range, the requirements of high-speed and safe operation of trains on the ballastless track roadbed are met, and the expenses for reinforcing and treating the expansive soil foundation are saved.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering foundation reinforcement, and in particular relates to an expansive soil foundation structure and a construction method containing a ballastless track subgrade. Background technique [0002] High-speed railway ballastless track has the advantages of high speed, high stability, and high safety, and has been widely developed and applied. However, to realize these advantages, it is necessary to ensure that the deformation of the subgrade is controlled within an extremely strict range. As a special soil with significant expansion and contraction characteristics, expansive soil poses a serious threat to the deformation of the ballastless track subgrade, and even causes deformation diseases such as uneven settlement, arching deformation, and subgrade extrusion of the subgrade. These diseases have repeated permanent, long-term and difficult to manage, which seriously restricts the constr...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of expansive soil foundation structure and construction method containing ballastless track subgrade, to solve the problem of swelling and deformation of expansive soil foundation when soaked in water and shrinkage deformation when dehydration proposed in the background technology, so that ballastless track Subgrade expansion and contraction deformation can be controlled within a reasonable range

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