Geosynthetics-packaged vacuum pre-pressed cushion structure

Abstract

The invention relates to a geosynthetics-packaged vacuum pre-pressed cushion structure. A cushion material is packaged by using a two-cloth one-membrane geotextile and geogrid; and the interior of the sealed two-cloth one-membrane geotextile is vacuumized so that the cushion layer is compressed into a whole under dual restrains of the pretension of the high-strength geogrid and atmospheric pressure, the overall stiffness of the cushion is greatly improved, and bearing capacity and stress regulation effect are improved. The two-cloth one-membrane geotextile is a cloth-like body which is formedby clamping a geomembrane between two geotextiles; and the geotextile is a permeable cloth-like fabric which is made from synthetic fibres. The materials of the cushion comprise macadam, sand, soil, limestone soil, cement soil, clay concrete and the like. Furthermore, the geosynthetics-packaged vacuum pre-pressed cushion structure has the characteristics of simple structure, reliability and convenient arrangement, and has wide application prospect for serving as cushion structures for railway bed composite foundation, foundation replacement and foundation bed replacement.

Description

technical field [0001] The invention relates to railway subgrade engineering, in particular to a cushion layer structure used for composite foundation, foundation replacement and subgrade bed replacement in subgrade engineering. Background technique [0002] The railway subgrade is the foundation of the track and an important part of the railway line. It is a building that supports the track and transmits the load of the train, and plays an important role in ensuring the safe operation of the train. The track and train loads and the self-weight of the roadbed on the railway subgrade surface will be transmitted to the foundation and borne by the foundation. Therefore, the stability of the foundation is very important to the stability of the railway subgrade. [0003] At present, for railways with higher line grades, when the foundation of the subgrade is not stable, composite foundation treatment is often used. The composite foundation is the foundation in which the piles i...

AI Technical Summary

Problems solved by technology

However, in fact, the stress and strain of the geogrid are very small, and the constraint effect on the displacement of the cushion material is limited. It is difficult to effectively play the role of the geogrid in the cushion structure, so that the stress adjustment effect of the cushion is very limited.

[0012] image 3 The shown concrete slab cushion structure, the stress adjustment function of the concrete slab is very obvious, but the cost is high and uneconomical

At the same time, when the concrete slab is thin, the strength is insufficient, it is easy to crack, and the ability to adapt to deformation is poor

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