High-speed railway roadbed structure of unsaturated soil foundation in plain region

Abstract

The invention discloses a high-speed railway roadbed structure of an unsaturated soil foundation in a plain region. The structure has the characteristics of strong integrity and good stability, can effectively control roadbed settlement, and meets the requirements of a high-speed railway for high smoothness, stability and durability of a line. The structure comprises an unsaturated soil foundation (10) and a road embankment filling body (20) filled in the unsaturated soil foundation, two sides of the slope toe of the road embankment filling body (20) are provided with back pressure road protection waterproof layers (40), a protective toe wall (50) is arranged at the outer side of the road embankment filling body, and the back pressure road protection waterproof layers (40) are compactly filled by non-permeable soil. The structure effectively solves the technical problems of the field; the high-speed railway embankment is directly constructed on the unsaturated soil foundation, so that the construction cost of the high-speed railway roadbed can be greatly reduced; the structure has the characteristics of strong integrity and good stability, can effectively control the influence of rainfall accumulated water on the roadbed settlement, and meets the requirements of the high-speed railway for high smoothness, stability and durability of the line; and the construction process is simple and meets the requirement of environmental protection.

Description

technical field [0001] The invention relates to a high-speed railway embankment structure, in particular to an unsaturated soil foundation high-speed railway embankment structure in plain areas. Background technique [0002] High-speed railways put forward new requirements for high ride comfort, stability and durability of the lines. Drainage in plain areas is very difficult. The drainage ditches set up on both sides of the railway embankment are often unable to be drained. In extreme weather such as heavy rainfall, water often floods the bottom of the railway embankment. The foundation soil in plain areas is mostly unsaturated soil. The latest research shows that , to build a high-speed railway on an unsaturated soil foundation, the foundation can be directly built without reinforcement or only with shallow reinforcement. However, when the unsaturated soil is affected by rainfall soaking, it will settle under the action of the embankment, and the deformation of the foundat...

AI Technical Summary

Problems solved by technology

However, when the unsaturated soil is affected by rainfall soaking, it will settle under the action of the embankment, and the deformation of the foundation is larger than that of the saturated soil, which will affect the high-speed railway's requirements for high track comfort

At present, the unsaturated soil foundation is mostly reinforced first and then the embankment is filled, and the drainage ditch structure is set on both sides of the embankment, which has the disadvantages of large engineering investment and unsatisfactory drainage effect.

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