Retaining Wall Base Width Formula

If the wall is l feet long h feet high and t inches thick then the trench needs to be l feet long 0 12h feet deep and 2t inches wide.

Retaining wall base width formula.

150 mm plus an additional 1 in. The footing is usually made of poured concrete but in some situations homeowners may instead opt to simply use tamped earth or a gravel base. Height of the retaining wall. Soil bearing and stability 8.

Thickness of the base. One key aspect of retaining wall construction is preparing a solid footing or foundation. Wood retaining walls 14. Stem thickness at the.

The interlocking retaining wall block can be used to build walls up to 24 to 36 inches high depending on the size of the block. Designing the cantilever wall stem 9. Counterfort retaining walls 12. Insufficient stem width resulting in failure or excessive rotation of the stem.

600 mm wide the length of the wall the depth of the trench will be 6 in. Building codes and retaining walls 5. We recommend making the base twice as wide as the block depth to account for settling. Width of the toe.

Divide the base depth of 5 to 7 inches depending on the height of the wall by 1 944 to determine the square yardage of the depth of the gravel base beneath the wall. Refer to figure a 2 below. Earthquake seismic design 7. Avoid having downspouts pointed at the retaining wall and if it s against the house keep soil and mulch well below the siding.

More information on retaining walls where the base trench steps up a slope. For level top surface the base width of wall is determined in the same way as the cantilever type retaining wall. Estimate the amount of gravel needed to pack the trench at the base of the retaining wall. Pier and pile foundations 11.

Before we proceed with the design it is important for the designer to know the geometric variable and parameters of the retaining wall. Figure a 2 retaining wall geometric variables. Width of the base. Dig a base trench 24 in.

Follow the block manufacturer s instructions for wall height limits. Cantilevered tilt up walls 13. Thoroughly planned and ably performed wall construction will help to ensure the retaining wall s stability. Gabion walls 16.

Insufficient footing width resulting in rotation or settlement of the wall. Preparing the retaining wall base. Forces on retaining walls 6. The retaining wall should be set embedded below grade on a level base of 6 gravel or stone.

Retaining wall base trench. 25 mm for each 1 ft 300 mm of wall height for the amount or buried block that is needed.