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Construction method for salty soil district railway roadbed with water content higher than liquid limit

A technology for railway subgrade and construction method, which is applied in the directions of roads, roads, buildings, etc., can solve the problems of long construction period of filling subgrade, difficult transportation of fillers, and poor economy, so as to improve overall stability, prevent settlement, and improve service life. Effect

Inactive Publication Date: 2013-08-14
CHINA RAILWAY 21ST BUREAU GROUP THE FOURTH ENG
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AI Technical Summary

Problems solved by technology

The disadvantage of this construction method is that the filler that meets the requirements is relatively far away from the saline soil section, the transportation of the filler is difficult, the distance is long, the economy is poor, and the construction period for filling the roadbed is long

Method used

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  • Construction method for salty soil district railway roadbed with water content higher than liquid limit

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Experimental program
Comparison scheme
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Embodiment Construction

[0022] a. Test the saline soil in the soil borrowing site

[0023] Sampling and testing the saline soil filling in the borrow site, the allowable salt content of the chlorine saline soil is 5.1%, and it can be used as railway subgrade filling after passing the test;

[0024] b. Filling flake layer

[0025] Fill the flake layer (1) on the base. The size of the flakes is 20-40cm. Less than 20% of the smaller flakes are allowed, but the block diameter shall not be less than 15cm. The flakes shall be filled to the design height by mechanical dumping. High, feed materials on both sides first and then in the middle, use Komatsu PC220 excavator for initial leveling, and then use TYG220 bulldozer to bulldoze, the top surface of the flake layer (1) is dense and flat, the side slope is smooth, and the width of the flake layer (1) exceeds the base road surface by 2m , the height is 0.8 meters higher than the weak ground, and a layer of smaller stones is laid on the top of it, and compac...

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Abstract

The invention discloses a construction method for a salty soil district railway roadbed with the water content higher than a liquid limit. The construction method comprises the working flow of checking salty soil, filling a sheet stone layer, filling a sand stone layer, filling a gravel reversed filter layer, filling a salty soil layer, and paving a sand cushion layer. By the construction method, soft roadbed soil is treated by throwing and filling sheet stones, so that the bearing capacity and the overall stability of the railway roadbed are improved, the cracking of edge slopes of the roadbed and other phenomena caused by settlement of the salty soil railway roadbed, mud exposure caused by slurry turning, salt expansion and the like are avoided, and the salty soil railway roadbed can be stably and normally used; the problem of lack of salty district roadbed fillings is solved, the materials are readily available, the cost is saved, and the construction method is economical and environmentally-friendly; and the two sides of the roadbed are widened, so that the roadbed can be protected, salination of a body of the railway roadbed is prevented, and the service life of the salty soil district railway roadbed is prolonged.

Description

technical field [0001] The invention relates to a construction method of a railway subgrade, in particular to a construction method of a railway subgrade in a section of saline soil with a water content higher than the liquid limit, and belongs to the technical field of railway construction. Background technique [0002] Railway subgrade is an important part of railway engineering, and it is the basis for bearing track and train loads. As a geotechnical structure, the subgrade must be strong, stable and durable, so as to resist the influence of various natural factors and ensure the safety and smoothness of railway transportation; as the focus of railway construction project management, subgrade construction quality control is the key to effectively reducing subgrade settlement. , The key to ensuring the safety of railway transportation. With the large-scale construction and development of my country's railway traffic engineering, the railway construction in western my co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/04
Inventor 吕俊团李寿福程世峰张靖雄赵平华薛吉安
Owner CHINA RAILWAY 21ST BUREAU GROUP THE FOURTH ENG
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