RU2482244C2 - Method for reinforcement of soil - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: method for soil reinforcement includes laying and filling of reinforcing tapes with soil. Reinforcing tapes are laid across the fill onto the surface of the filled layer with levelling and compaction, and are filled with soil of the next layer. One end of each reinforcing tape is clamped between gabions of a retaining wall, and the other one is brought to the opposite slope of the fill. Reinforcing tapes are made of a polymer material containing steel wires extended along the reinforcing tape, surfaces of reinforcing tapes are structured with transverse ribs. The surface of steel wire is structured with burrs. Ends of reinforcing tapes are cut in longitudinal direction to form two or more strips, which are laid like a fan.

EFFECT: increased efficiency of the soil reinforcement method, strength of a polymer reinforcing tape and intensity of soil and reinforcing tape interaction.

3 cl, 4 dwg

Description

The invention relates to the field of construction, namely to reinforcing the soil reinforcement of slopes, slopes, embankments, fillings of retaining walls, as well as the foundations of structures.

Reinforcement of the soil is carried out by laying and filling the soil with reinforcing elements made of various materials - metal, reinforced concrete, fabric cords, fiberglass and polymers. It is generally accepted that reinforcing elements made of polymer materials, such as woven and non-woven geotextiles, geogrids, geogrids and geomembranes, are most effective for soil reinforcement.

Common disadvantages of reinforcing elements made of polymeric materials are as follows. Firstly, all of them form a continuous reinforcing layer in the soil, which leads to their high material consumption. Secondly, the deformation of the reinforcing elements due to the creep of the polymers can exceed the allowable values, which limits the allowable tensile loads. At the same time, quality mutual engagement of soil and geogrid or geomembrane is not always ensured, especially in sandy and sandy loam areas. All this reduces the efficiency of the reinforcing elements of polymer materials, therefore, the effectiveness of the method of reinforcing the soil with such reinforcing elements as a whole.

Reinforcing elements are known in the form of metal-plastic (same: steel-polymer) geogrids. Due to the combination of plastic and metal, such geogrids have high strength and low creep deformation; therefore, they can most often be used when reinforcing the soil by filling the high retaining wall [1]. The disadvantage of the method of reinforcing the soil with metal-plastic nets is its material consumption, as well as the insufficient mutual engagement of the soil and the geogrid.

A known method of reinforcing the soil, including laying and backfilling with soil of flexible reinforcing tapes [2], while the ends of the reinforcing tapes can be woven into a flexible enclosing surface forming a wall [3], or placed with a block in one of the blocks forming a wall [4] .

In these known methods, the transmission of tensile forces from the ground to the reinforcing tape substantially does not occur directly during their interaction, but through the wall, which causes high loads from the ground first to the wall, and then to the reinforcing tapes. All this increases the consumption of materials and costs in the implementation of the methods and reduces the effectiveness of these methods in general.

The problem to which the invention is directed, is to increase the efficiency of the soil reinforcement method, and the technical result is to increase the strength of the polymer reinforcing tape and to increase the intensity of interaction of the soil and the reinforcing tape.

The problem is solved, and the technical result is achieved by the fact that the method includes laying and filling with soil the reinforcing tapes, each of which is made of polymer material and contains steel wires elongated along the reinforcing tape from one end to the other. The surface of the reinforcing tape on both sides is structured by transverse ribs made of polymer, which increase the intensity of the interaction of the soil and the reinforcing tape. Moreover, opposite each transverse rib on one side of the reinforcing tape is a transverse rib on the other side of the reinforcing tape. Additionally, the surface of the steel wire is structured by irregularities, and the ends of the reinforcing tapes are cut in the longitudinal direction with the formation of two or more strips, which are laid with a fan.

The invention is illustrated by drawings, which schematically depict:

figure 1 - earthen embankment of the railway track, layer-by-layer reinforced with reinforcing tapes, cross section;

figure 2 - two adjacent reinforcing tape rolled out on the surface of the soil layer, top view;

figure 3 is a section aa in figure 2, a cross section of a reinforcing tape;

figure 4 is a section bB in figure 2, a longitudinal section of a section of a reinforcing tape.

Example. A double-track railway line is laid in a cramped area. In order to reduce the occupied area, a relatively high soil embankment (hereinafter: embankment) of 1 path is carried out in a cross-sectional profile. Compression of the embankment 1 is carried out by layer-by-layer reinforcement of the soil of the embankment 1 with reinforcing tapes 2, and in particularly cramped areas and by additionally performing the retaining wall 3 of gabions 4 (Fig. 1).

Each reinforcing tape 2 is made of polymeric material and contains steel wires 5 extended along the reinforcing tape 2 from one end to the other, and the surface of the reinforcing tape 2 is structured on both sides by transverse ribs 6 made of polymer (Fig. 3 and Fig. four). Opposite each transverse rib 6, on one side of the reinforcing tape 2, there is a transverse rib 6 on the other side of the reinforcing tape 2, which each time forms a pair of adjacent ribs. This paired arrangement of the transverse ribs 6 simplifies the force interaction of the reinforcing tape 2 with the soil of the embankment 1 and makes it more uniform on both sides of the reinforcing tape 2.

The reinforcing tape 2 works in tension, and its main power element is steel wire 5. However, the transfer of tensile forces from the soil of the embankment 1 to the steel wire 5 may be limited by insufficient adhesion of the polymer to the surface of the steel wire 5. Therefore, it is advisable to structure the surface of the steel wire 5 with irregularities can be created by mechanical corrugation or laser.

When implementing the method, the reinforcing tapes are laid across the embankment 1 on the surface of the soil layer 7 poured with leveling and compaction (layers 1 through 4) and covered with soil of the subsequent layer 7. In this case, one end 8 of each reinforcing tape 2 is pinched between gabions 4 retaining wall 2, and the other end 9 is withdrawn in free form on the opposite free slope 10 of the embankment 1.

In the example, the height of the soil layer 7 is taken equal to the height of the gabion 4, which is usually equal to 1.0 meter. The width and thickness of the reinforcing tape 2 and the distance between their axes 12, the dimensions of the transverse ribs 6 and the distance between them, as well as the number and diameter of the steel wire 5 are set based on local conditions and calculation data - see drawings and notation.

It is advisable to cut the free end of the reinforcing tape 2 in the longitudinal direction, for example, into three strips 11 and lay them on the surface of the soil layer 7 with a fan. This will improve the quality of soil reinforcement directly at the slope 10.

Reinforcement of the soil with a polymer tape 2, containing inside the steel wire 5, and transverse ribs 6 on the surface, provides high strength of the tape 2 with its low extensibility and increases the intensity of the interaction of soil and reinforcing tape 2, which increases the efficiency of the method of soil reinforcement as a whole.

Designations

1 - soil embankment (hereinafter: embankment)

2 - reinforcing tapes

3 - retaining wall

4 - gabions

5 - steel wire

6 - transverse ribs

7 - soil layer

8 - the end of the tape (pinched)

9 - the end of the tape (free)

10 - slope (free)

11 - strip (at the end of the tape)

12 - axis of the reinforcing tape

13 - axis of the railway track

14 - sleepers

15 - rail

16 - drainage ditch

17 - travel cover

18 - drainage layer

19 - the natural surface of the earth

a - tape width

δ is the thickness of the tape

in - the distance between the tapes in the plan

h - rib height

d - rib thickness

s - step of the rib

Information sources

1.Http://tp-geosintetika.ru/goods_category/geosetka.html from 07/19/2011. Metal-plastic geogrid.

2. EP 0232175 A1, publ. 08/12/87.

3. Patent of the Russian Federation No. 2181407, cl. EB02 3/06, publ. 20.04.2002.

4. Application for the invention of the Russian Federation No. 2006137277, cl. E02D 29/02, publ. 05/10/2008.

Claims (3)

1. A method of reinforcing the soil, including laying and filling with soil the reinforcing tapes, characterized in that the reinforcing tapes are laid across the embankment on the surface of the soil layer that has been leveled with leveling and compaction, and the next layer is covered with soil, one end of each reinforcing tape is jammed between the gabions of the retaining wall, and the other is led to the opposite slope of the embankment, while the reinforcing tapes are made of a polymeric material containing steel wires elongated along the reinforcing tape, the surfaces of the reinforcement Tapes are structured with transverse ribs. 2. The method according to claim 1, characterized in that the surface of the steel wire is structured by irregularities. 3. The method according to claim 1, characterized in that the ends of the reinforcing tapes are cut in the longitudinal direction with the formation of two or more strips that are laid out in a fan.

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