About the Honeycomb Retaining Systems?
The Versatile Interlocking Retaining Block

The system consists of dry stacking the interlocking blocks one on top of each other and filling the hollows in the blocks with compacted soil. The usual slope of the wall is 70 degrees to the horizontal but this can be varied to suit prevailing conditions.

Typical Cross-Section of a Honeycomb® Wall Structure

The top surface of each block is provided with a 10mm step which gives the interlock action in the horizontal plane.

As with most retaining structures it is desirable that the material used for backfill be a granular free draining soil in order to prevent pore pressure build-up. If this is not practical some form of drainage behind the wall will be necessary. However, in normal conditions the vertical joints between the blocks provide adequate drainage.

It has been found from experience with the many walls already erected, that the single block wide structures containing granular materials can be satisfactorily installed to between 3 to 4m in height. Walls higher than this can be erected using a double block system or by a single wide block system incorporating backfill reinforced with layers geofabric or geogrid clamped between the horizontal joints in the wall.
Depending on the properties of the inclination of the retained material, it has also been found from erected walls that it is possible to design, single block wide walls, without reinforced backfill, in excess of 3 to 4m. However, it must be emphasized by the designer as the properties of both fill and foundation materials will be the limiting factors and will require special consideration.

During construction of the walls the compacting of the backfill for 1m behind the wall should only be done by light compacting equipment, such as hand stampers or small vibrating plates or rollers, as heavy compaction rollers can displace the blocks or damage the geofabric reinforcement.

Particular attention should be paid to the proper compaction of the material within the blocks as this mass is used in the stability calculations.

 


 

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