Ground Stabilisation

Plant Depot, Abgrid and Terrex, Bredbury, Manchester, UK

Project Information

Client:DCT Civil Engineering
Contractor:DCT Civil Engineering
Consultant:ABG Geosynthetics
Product:Abgrid 30/30 Geogrid
Terrex NW9 Geotextile
Quantity:8,000m2
Benefits:- No dig solution
- Saved 8,000 tonnes of hardcore
- Commercial saving of £100,000


Project Description

A piece of land was purchased by DCT Civil Engineering with the intention of constructing a new plant and equipment storage facility. A 6F2 crushed brick hardcore material was available for use as a capping layer and the final surface was to remain unpaved.

The Challenge

The contract manager’s dilemma was in choosing a minimum cost method of stabilisation that could be installed quickly and be relied upon to stabilise the ground ready for use. A number of methods were considered but all appeared to have disadvantages.

These included:

  • Punching some of the crushed brick into the ground to stiffen the in-situ soils;
  • The removal of 2m depth of clay and the importation of clean fill;
  • An engineered geosynthetic solution.

The first option was trialled on site but failed to produce the results required by the contract manager and was not pursued further. Approximately 500mm of 6F2 was punched into the soft ground but the clay still came through and the formation deformed under the vibrating roller.

The second option was discounted as it was considered to be both time consuming and very expensive due to the high disposal costs of the materials excavated from the site.

The third option required confidence that relatively thin geosynthetics would be strong enough for such weak ground and coarse hardcore.

The Solution

DCT’s contract manager approached ABG, whose technical team reassuringly calculated that a geosynthetic solution would be both technically viable and cost effective. ABG’s calculations showed that a 400mm layer of 6F2 hardcore laid on to Abgrid 30/30 geogrid with Terrex NW9 geotextile underneath would create a stable surface over a weak 2% CBR ground.
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ABG Abgrid Geogrid for ground reinforcement and stabilisation

The Terrex NW9 geotextile provided separation to prevent soft in-situ ground from squeezing through the Abgrid geogrid into the 6F2, a solution recommended for all ground conditions of CBR <3% and saving a further 150mm of 6F2. The geogrid provided strength to enable the 6F2 layer thickness to be reduced by approximately 30%, giving a total saving of 400mm of 6F2 on this project. The Terrex NW9 geotextile and Abgrid 30/30 geogrid were rolled out together, a technique proving significantly cheaper than using a combined geogrid and geotextile all-in-one product.

The ABG Service

ABG provided full technical support, including design and installation advice.

Contact ABG today to discuss your ground stabilisation project specific requirements and discover how ABG past experience and innovative products can help on your project.

Geotextile and Geogrid providing ground stabilisation for a stone layer
6F2 hardcore was punched into soft and wet weak ground and was lost6F2 hardcore was punched into soft and wet weak ground and was lost
Soft clay ground of 2% CBR was easily deformed by thumb pressureSoft clay ground of 2% CBR was easily deformed by thumb pressure
Terrex geotextile and Abgrid geogrid rolled out together in one operationTerrex geotextile and Abgrid geogrid rolled out together in one operation
Terrex geotextile and Abgrid geogrid supporting 6F2 hardcore over soft groundTerrex geotextile and Abgrid geogrid supporting 6F2 hardcore over soft ground


Abgrid Geogrid

Abgrid biaxial geogrid can be used in a wide range of civil engineering applications such as basal reinforcement, ground stabilisation, aggregate reduction, piling platforms and foundation engineering in paved and unpaved roads and temporary works.

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Abgrid Geogrid

Terrex NW Geotextile

Terrex NW Geotextile is a range of staple fibre, needle punched and thermally bonded non-woven geotextiles designed specifically to offer optimum performance per unit weight.

more...

Terrex NW Geotextiles from ABG Geosynthetics
 

Products

Abgrid Geogrid

Abgrid biaxial geogrid can be used in a wide range of civil engineering applications such as basal reinforcement, ground stabilisation, aggregate reduction, piling platforms and foundation engineering in paved and unpaved roads and temporary works.

more...

Abgrid Geogrid

Terrex NW Geotextile

Terrex NW Geotextile is a range of staple fibre, needle punched and thermally bonded non-woven geotextiles designed specifically to offer optimum performance per unit weight.

more...

Terrex NW Geotextiles from ABG Geosynthetics
 

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