Geosynthetic materials GEOSPAN for road construction

Woven geotextile

Geospan TN is a multifunctional woven geotextile (geotextile) made of durable polypropylene fibers. Designed to reinforce soils and structural elements of road structures. The main functions of woven geotextile Geospan TN:

• Reinforcement and separation of materials of contacting layers.

• Uniform distribution of the load over the structure of a strong geotextile over a large area of the base, composed of weak soils.

• Capillary interruption - reduces deformations from frost heaving of the soil.

Geospan TN woven geotextile is used in the construction of embankments on soft soils, in the preparation of temporary roads and work sites for heavy equipment, in construction under extreme conditions (permafrost, swamps of all types). Geospan TN is widely used as an alternative and more durable replacement for needle-punched geotextiles of the "Dornit" type.

Geospan TN is produced from 100% polypropylene using modern technological equipment. Compliance with production technology ensures high resistance to environmental factors. Woven geotextile Geospan TN is able to work in aggressive soil environments (limestone rocks, alkaline clay soils, etc.). Geotextile is resistant to ultraviolet radiation, temperature extremes and other external influences.

Geospan TN PE is a high-strength woven geotextile (geotextile) made of polyester fibers for reinforcing soils and separating layers. Geospan TN PE well perceives high tensile stresses with a small elongation and is resistant to mechanical damage and chemically aggressive environments. Due to this, geotextile is widely used in earthworks in cases where it is necessary to reinforce soil structures with small permissible deformations. Geospan TN PE woven geotextiles are produced in ten standard types with tensile strength values of 80 - 500 kN/m in the longitudinal direction.

Non Woven Thermally Bonded Geotextile

Geospan TS is a non-woven geotextile made from thermally bonded fibers of 100% polyester. Designed to create drainage systems of all types, providing efficient removal of groundwater and wastewater. Geospan TS geotextile prevents the penetration of soil particles into drains, while it has excellent water permeability and does not silt during the entire period of operation.

Volumetric geogrid (Geocells)

Volumetric geogrid Geospan OR is a honeycomb structure made of polyethylene tapes fastened together with high-strength welds. When folded, the volumetric geogrid is a compact module, convenient for storage and transportation. In the stretched state, it forms a strong frame for fixing the filler in the cells of the geogrid (sand, crushed stone, soil, concrete). The geogrid is produced, as a rule, with perforation (Geospan ORP) - this improves the drainage characteristics of the structure. The volumetric geogrid does not age under the influence of low temperatures, acidic and alkaline soils, ultraviolet radiation and other factors. The strength of welds is the main quality parameter of the geogrid.

To install a volumetric geogrid, complex technologies and equipment are not needed. Sections are fastened with a mechanical or pneumatic stapler. The Geospan OR geogrid is mounted on the underlying one (for example, Geospan TN or Geospan TS). The geogrid is attached to the slope surface with anchors, and the cells are filled with an inert material.

Road construction

The advent of geosynthetic materials has revolutionized road construction. New possibilities in design became available, the efficiency of construction and the durability of pavement increased. It became possible to build roads on soft soils in almost any weather conditions.

Geospan engineers developed structural solutions and their feasibility study taking into account existing road standards:

• Ø Reinforcement of embankments on weak foundations and structural layers of road structures;

• Ø Construction on swamps of types 1 and 2 without peat;

• Ø Construction of roads on heaving soils;

• Ø Reducing the consumption of inert materials (crushed stone, gravel, sand, etc.) or saving on chemical methods of base stabilization;

• Ø Strengthening (anti-erosion protection) of slopes and slopes;

• Ø Construction in the permafrost zone;

• Ø Reinforced soil structures and retaining walls;

• Ø Drainage and drainage devices;

• Ø Strengthening the slopes of flooded embankments on fast currents;

• Ø Construction of access roads and sites of industrial facilities.

Geospan geomaterials have been tested and recommended for use by Federal Road Agency Rosavtodor and Rosdor NII Research Institute. Since 2006, the experience of applying Geospan materials on federal and regional highways and transport infrastructure facilities has more than 100 large facilities.

The use of high-strength woven geotextiles Geospan TN as protective and reinforcing layers in road structures enables:

• increase the bearing capacity of the base and the entire structure of the pavement as a whole, without increasing its material consumption,

• eliminate the interpenetration of crushed stone and sand (especially with vibration compaction),

• reduce the thickness of the layer of graded crushed stone, providing the required parameters for the strength of the structure,

• minimize the risk of uneven subsidence and frost heaving of the soil.

At the same time, the dynamics of accumulation and the magnitude of residual deformations of the road structure are significantly reduced due to the fact that the magnitude of shear stresses in the sandy underlying layer and soil of the road bed is reduced.

Oil and gas industry

The use of high-quality geosynthetic materials makes it possible to achieve high stability and durability of structures, with a reduction in project time and costs. It becomes possible to build roads and pipelines in difficult conditions. With the help of Geospan materials you can solve the following tasks:

• Ø Construction of access roads and sites in swamps of all types;

• Ø Bunding and ballasting of pipelines;

• Ø Reinforced soil structures of technological sites.

The use of reinforcing-separating layers Geospan TN at the base of the embankment during the construction of the road under given conditions reduces the amount of settlement according to the calculation, making it more uniform and increasing the overall stability of the structure. This leads to savings in bulk soil, construction time is reduced and the quality of work is improved due to less labor intensity and greater manufacturability. Transport costs are reduced, the service life of the structure is increased in comparison with the construction by traditional methods.

Reinforcing geotextile layers are recommended to be used even in cases where the lower part of the embankment is built from peat or clay soil with high humidity. At the same time, Geospan TN is placed at the contact boundary of soils of different composition, which ensures an increase in the bearing capacity of the subgrade.

Variants of design solutions for the use of Geospan TN on peat bases (including the use of reinforcement technology in the form of a envelope) are shown in Figure 1.

1 - embankment; 2 - the lower part of the embankment from the draining soil; 3.5 - Geospan TN; 4 - weak soil; 6 - local soil - strongly decomposed peat.

Hydraulic engineering

Modern Geospan materials are used in all areas of hydraulic engineering and perform the functions of reinforcement, filtration, drainage, and protection.

• Ø Construction of facilities to protect the coastline;

• Ø Reinforcement of slopes and embankments, cones of bridges;

• Ø Drainage and drainage devices;

• Ø Waterproofing;

• Ø Dehydration and disposal of solid waste using geotube technology.

Thus, structures using modern Geospan geosynthetic materials are effective for solving most of the urgent problems of transport construction and enable in practice to obtain a real technical and economic effect.