Construction and construction method of expansive soil foundation with ballastless track subgrade

Abstract

The invention provides an expansive soil foundation structure and construction method containing ballastless track subgrade, comprising porous pipe piles, expansive soil foundation, geosynthetic material reinforced cushion and ballastless track subgrade, the porous pipe pile and expansive soil The foundation is set at the bottom, and above it, a geosynthetic material reinforced cushion and a ballastless track subgrade are arranged in sequence from bottom to top; a plurality of porous pipe piles are vertically arranged in the expansive soil foundation, and the porous pipe piles include hollow porous The pile body and the elastomer material filled therein, the hollow porous pile body is a hollow reinforced concrete structure, and the porous pipe pile also includes a radial through hole passing through the inner and outer walls of the hollow porous pile body in the radial direction. The invention effectively reduces the expansion and contraction deformation of the expansive soil foundation when it loses water, so that the expansion and contraction deformation of the ballastless track subgrade is controlled within a reasonable range, which meets the high-speed and safe operation requirements of trains on the ballastless track subgrade, and saves expansive soil The cost of ground reinforcement treatment.

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...

AI Technical Summary

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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