Ballastless track railway expansive soil cutting structure and construction method

Abstract

The invention discloses a ballastless track railway expansive soil cutting structure and a construction method. The ballastless track railway expansive soil cutting structure and the construction method effectively solve the problem of upwarp deformation caused when a high-speed ballastless track railway passes through expansive soil cutting, and meet the requirement of the high-speed railway on the line smoothness. The structure comprises cement fly ash gravel piles, elastic geotechnical profiles, a cushion layer structure, a foundation bed bottom layer, a foundation bed surface layer and drainage side ditches, wherein the cement fly ash gravel piles are transversely and longitudinally arranged in an expansive soil foundation in rows at intervals to form a composite foundation, and the setting depths exceed the expansive soil atmospheric influence depth; the elastic geotechnical profiles are arranged in the surface layer of the expansive soil foundation between every two adjacent transverse rows of cement fly ash gravel piles, and extend in the longitudinal direction of the expansive soil foundation; the cushion layer structure is constructed at the top of the composite foundation layer by layer in a filling mode; the foundation bed bottom layer is constructed at the top of the cushion layer structure layer by layer in a filling mode; the foundation bed surface layer is constructed at the top of the foundation bed bottom layer in a filling mode layer by layer; and the drainage side ditches are arranged on two sides of the cutting structure, and are provided with longitudinal blind grooves at the bottoms.

Description

technical field [0001] The invention relates to geotechnical engineering, in particular to the problem of anti-expansion upturning of expansive soil cutting engineering of high-speed ballastless track railway. Background technique [0002] High-speed railways, especially ballastless track railways, have very strict control over the deformation of the subgrade. Usually, the subgrade of high-speed railways is to solve the problem of settlement deformation. It will generate an upward expansion force, which will cause the high-speed railway ballastless track to appear arching deformation. When the arching deformation is large, it will seriously affect the operation safety of the high-speed railway, and the arching deformation is difficult to repair under the current technical conditions and take effective measures to solve it. . Therefore, there is an urgent need for a ballastless track railway expansive soil cutting structure to solve the existing problems, and it should have ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a ballastless track railway expansive soil cutting structure to effectively solve the problem of high-speed ballastless track railway passing through expansive soil cuttings and arch deformation, and to meet the requirements of high-speed railways for track smoothness

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