Concrete Lego Block Retaining Wall Design
Concrete interlocking blocks make very good retaining walls. The benefits are:
- Durable and long lasting (>100 years)
- Fast to build
The disadvantage is they cannot travel around bend very well. They work best when the wall is straight.
The wall heights are in modules of either 600mm or 800mm depending of the size of wall and the block used.
They can be used from a height of 0.6m to 4m.
The concrete design mix is normally 35 to 50kN/mm2 in strength and there is no steel reinforcement in the blocks. Concrete strengths less than this will reduce the design life of the blocks.
There is no need for a heavy foundation. The blocks need to be laid on firm ground on 100mm of concrete to give the wall a level and flat foundation.
Drainage is required at the back of the wall to stop any hydrostatic pressure building up that may cause an issue. The drainage is normally a perforated pipe and the back of the wall back filled with clear stone to allow for water to flow down to the drain.
Concrete Block Design Table
You can use the concrete lego block retaining wall design table above as a guide. The table gives you a number of wall heights and the number and size of blocks required for the height of the wall.
The design table above presents for the reinforced block retaining walls are Indicative designs based upon a base material with allowable bearing pressure of >200kPa.
The retained material is assumed to be well graded, granular backfill with back of wall drainage or weep holes to relieve hydrostatic pressure.
All indicative information presented in this table is based upon assumed loading and ground conditions and may be subject to change following detailed, site specific design.
Lego Block Retaining Wall Images
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