The design tables have been produced utilizing standard
design concepts and procedures developed for gravity and geogrid
reinforced soil walls.
The tables provide the owner, designer, architect and installer
a means to evaluate preliminary costs and construction limits.
For illustration purposes and following conservative design
practices, geogrid requirements for Legend units are illustrated
as identical to the requirements for Classic 8" units.
Table Descriptions
The tables have been prepared for wall sections which range
in height from 4 to 12 feet. The tables are separated for
loading conditions as follows:
Design Table #1: Classic 6"
Units where the area behind the wall is level with no loads.
Design Table #2: Classic
6" Units where the area behind the wall is level with
surcharge loads.
Design Table #3: Classic
6" Units where the area behind the wall is sloped.
Design Table #4: Classic
8" and Legend Units where the area behind the wall
is level with no loads.
Design Table #5: Classic
8" and Legend Units where the area behind the wall
is level with surcharge loads.
Design Table #6: Classic
8" and Legend Units where the area behind the wall
is sloped.
The angle of internal friction is shown in the design tables.
The unit weight of the soil is assumed to be 120 PCF. The
allowable bearing strength of soil is assumed adequate. The factor
of safety for sliding is 1.5 and the factor of safety for
overturning is 2.0 or better. Global slope stability has
not been checked.
The long term design strength used in the charts has been
provided by the respective geogrid companies. Dimensions
shown in the tables are in feet. For wall heights between
those shown, use the next higher value in the table.
Wall heights below four feet have not been shown, but
geogrid may be required depending upon specific site and soil
considerations. The information provided in these tables is only
for estimating purposes. Final design must be prepared by a
qualified engineer. It is the user's responsibility to insure
proper application of these estimating tables.