Geoscience Reference
In-Depth Information
properties. The purpose is to give the necessary background information to allow
engineers to judge for themselves if any special requirement is needed.
3 MAIN DESIGN PARAMETERS
A design of a reinforced soil structure must be made in accordance with the valid
design codes and standards in that country.
The main design requirements for the use of geogrids in soil structures
result from the geotechnical design. This includes the calculation of different
failure modes resulting in requirements for:
Axial tensile design strength of the geogrid
Maximum strain requirements in the geogrid
The practice is to design for the ultimate limit state (strength requirement)
and to check for the serviceability state (strain level and deformation). In BS 8006
(1996), different requirements are formulated for the design of reinforced walls,
abutments, and reinforced slopes.
Important parameters of the geogrids necessary for these designs are the
design strength and strain characteristics during the service life of the structure
and the bond coefficient, which in turn depends heavily on the fill and underlying
soil (Fig. 1).
Figure 1 Reinforcing mechanisms in walls and slopes.
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