Terraforce L18

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Design table - Terraforce L18

Maximum wall heights (in block height, metres, feet) for a single skin, mass gravity, block retaining wall system - without additional interlocking keys, reinforcements or backfill stabilizing.

Wall height measured from top of foundation / levelling pad.
Top of foundation / levelling pad a minimum of 150mm / 0.5 ft below ground level
No allowance made for surcharge above wall
Angle of internal friction used in calculations: P(firm clay)>26°,P(silty sand)>32°.
Compaction effort at optimum moisture content to ensure maximum density achievable.
Provided that groundwater conditions are controlled, a wide variety of soil types can be used for infill soil.
Subsoil drainage is essential to intercept groundwater. Build-up of hydrostatic pressure and seepage forces minimised.
Surface water run-off should be directed away from the wall