Desert area migratory dune land railway bed construction method

Abstract

A desert area migratory dune land railway bed construction method includes the steps of: A. leveling and rolling compaction: conducting leveling and rolling compaction on the original ground; and laying pure aeolian sand on the bed ground after rolling compaction; B. arranging a grid coffer: sectioning the pure aeolian sand laid on the bed to make the grid coffer, which is about 10m long, about 5m wide, 0.3m high and 0.3m thick; C. water injection and rolling compaction: injecting water to the coffer by sprinkling irrigation of a sprinkler at the speed of 20m / h, with the water injection rate being 1m and the water sprinkling amount being 10m; when the height of water head steadily reaches 20cm, stopping water injection; after 40-45min of stopping water injection and the thorough permeation of water into sand, conducting rolling compaction; laying the pure aeolian sand on the bed ground after rolling compaction; and repeating the steps of B and C until finishing filling the bed; and D. covering a side slope with clay: after the bed is formed, then digging steps on the embankment slope surface of sand body roads and the slope surface of foundation beds, and sprinkling water on the slope surfaces provided with the steps for moistening; and laying clay on the slope surface to cover the side, wherein the forming thickness of the side slope covered with clay is at least 30cm.

Description

technical field [0001] The invention relates to the technical field of railway building construction, in particular to a construction method for a railway embankment in a mobile sand dune zone in a desert area. Background technique [0002] my country's deserts are widely distributed and have harsh climatic conditions. With the rapid development of the country's economic construction, the speed of railway construction has accelerated, and it has become very common to build railways in desert areas. However, a large amount of roadbed filler must be used in the construction of railways in desert areas at this stage, but desert areas are sparsely populated and lack of roadbed fillers. The railway embankment includes two parts: the embankment below the subgrade bed and the subgrade bed, and the subgrade bed includes two parts: the base and the subgrade surface; the width of the railway subgrade in desert areas is 7.1 meters, and the height of the subgrade is up to 10 meters. Th...

AI Technical Summary

Problems solved by technology

However, a large amount of roadbed filler must be used in the construction of railways in desert areas at this stage, but desert areas are sparsely populated and lack of roadbed fillers.

The railway embankment includes two parts: the embankment below the subgrade bed and the subgrade bed, and the subgrade bed includes two parts: the base and the subgrade surface; the width of the railway subgrade in desert areas is 7.1 meters, and the height of the subgrade is up to 10 meters. The subgrade is filled according to the traditional method. It is necessary to transport a large amount of qualified filler from other places to build embankments and foundations, and it is very difficult to build transportation access roads in desert areas

At present, the technologies related to desert control are all focused on greening and windbreak and sand fixation. There is a lack of research on the use of pure aeolian sand in shifting dune areas as railway embankment filler.

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