Timber Retaining Wall Design Calculations

Height of retaining wall hwall hstem tbase dds 3850 mm depth of cover in front of wall dcover 0 mm depth of unplanned excavation dexc 0 mm height of ground water behind wall hwater 0.

Timber retaining wall design calculations. Divide the width of the wall in inches by the width of the block and round up this is the number of columns. 1 2 example wall the example wall is shown in figure x 2 and consists of a 4 m high timber pole wall with ground anchor tie backs. Use a level placed on top of a timber to periodically check your work. Types of retaining walls tieback wall tieback is a horizontal wire or rod or a helical anchor use to reinforce retaining wall for stability one end of the tieback is secured to the wall while the other end is anchored to a stable structure i e.

Tamp to a level base. For specific wall components requiring time dependent calculations e g long term creep and corrosion of reinforcement a design life of 75 years should be used in analyses. Where there is any variation to the limitations stated in this data sheet including materials soil conditions drainage surcharge additional loads or geometry of the retaining. Compute resisting moments based upon the assumed footing width calculated about the front edge of the footing.

T 250mm minimum based on the above approximate geometric proportions let us assumed the following parameters to be used in our design. Concrete deadman driven into the ground or anchored into the earth with sufficient resistance. So in our case 1 foot wide for a 2 foot high wall image 4. Construction of timber retaining walls in residential settings and shall not be used where design or construction exceeds any of the following limits or exclusions.

The wall is assumed to be protecting a levelled dwelling platform with a steep 20 degree hill slope above. For a trial assume the footing width to be about 1 2 to 2 3 s the height of the wall with 1 3 being at the toe. Compute overturning moments calculated about the front toe bottom edge of the footing. Calculate the rows and columns.

Make the trench about 8 inches deep. Divide the height of the wall in inches by the height of the block and round up this is the number of rows. The example calculations are made here using mathcad. The design life of a retaining structure includes both stability and serviceability aspects.

The base of the retaining wall should be half the wall s height.