A foam light soil high railway foundation

Abstract

The invention discloses a foam lightweight soil high-speed rail roadbed. The foam lightweight soil high-speed rail roadbed is characterized in that the part of the roadbed, 0-1.0m under the roadbed top, is poured by foam lightweight soil with bubble rate being 66.6%, the foam lightweight soil per cubic meter is formed by mixing 343kg of cement and 223kg of water with a foaming agent and then foaming, and the construction wet density is 570kg / m<3>-600kg / m<3>; the part of the roadbed, more than 1.0m under the roadbed top, is poured by foam lightweight soil with bubble rate being 69.6%, the foam lightweight soil per cubic meter is formed by mixing 312kg of cement and 203kg of water with the foaming agent and then foaming, and the construction wet density is 550kg / m<3>-570kg / m<3>. The foam lightweight soil high-speed rail roadbed has high strength and stable performance, is not easy to settle and deform, and can guarantee a high speed train to run smoothly and steadily and safely and reduce the maintenance cost in the operation period in the future.

Description

technical field [0001] The invention belongs to the technical field of building construction, and particularly relates to a foam light soil high-grade railway foundation, which is poured with foam light soil with high strength and good wet density, and can ensure the strength and overall stability of the formed foam light soil roadbed . Background technique [0002] In recent years, my country has promoted the climax of railway construction. In the past ten years, my country's railways will build more than 12,000 kilometers of passenger dedicated lines, and will carry out speed-up reconstruction of 20,000 kilometers of existing lines at a speed of 200 kilometers per hour. house construction. The high-speed operation of trains has high requirements on the smoothness of the track, otherwise high-speed operation cannot be realized. The roadbed is the foundation of the track, so there must be strict restrictions on the smoothness and stability of the roadbed. [0003] Railway ...

AI Technical Summary

Problems solved by technology

The foundation structures are further divided into cast-in-place structure foundations and filling structure foundations. The cast-in-place structure foundations are bridges, tunnels and other structures that must be set up for railways crossing rivers and mountains. The filling structure foundations are usually filled with graded gravel or Graded sand and gravel mixed with a certain amount of cement, filled with AB materials and other design forms of railway subgrade, these two different foundation structures have great differences in strength, stiffness, deformation, materials, etc., which are likely to cause unevenness Subsidence, deformation and other diseases cause the impact of the train on the track structure when passing through the foundation junction, which in turn causes the train to generate large vibrations, resulting in deterioration of the operating conditions of the train, reducing the life of the vehicle and track structure, and affecting the stability and safety of the high-speed train operation And other issues

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