Block & Geogrid Data Tab for Gravity Walls

Block & Geogrid Data Tab (for Geogrid Reinforced Walls)

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Segmental Type:

Select either Gravity of Geogrid (this example is Gravity)

Retained height:

Enter the retained height, which is assumed to be the total wall height above the setting base. It should be an even multiple of block heights.

Embedment:

Depth below grade to top of setting pad. Usually one block course or 1’-0”

Backfill slope:

Select from the drop down menu, which will also display the slope angle.

Soil density, exterior (in situ):

Enter the density of the native soil beyond the backfill zone and under the base.

Soil density, interior (backfill):

Enter the density of the backfill material (usually granular soil or gravel.).

Soil friction angle, Φie, exterior:

Enter the angle of internal friction of in-situ soil.

Wall/soil friction angle, δ:

Enter the friction angle at the wall interface (usually 2/3 Φe)

Soil friction angle, Φi, interior:

Enter the angles of internal friction of the backfill soil.

Surcharge DL, psf:

Enter the dead load surcharge.

Surcharge LL, psf:

Enter the live load surcharge – it will not be used to resist overturning or sliding.

Seismic kh factor:

Enter seismic acceleration factor. (generally kh = 0.15 maximum – see Methodology)

Select block

From the drop down menu select the vendor and block you want to use. More vendors will be added as we receive requests. Highlighting a selected block will insert its values into the criteria below.

Block depth, in:

This will be automatically input based upon block selection.

Block height, in:

This will be automatically input based upon block selection.

Block weight, psf:

This will be automatically input. Note that the full block depth is assumed to be in-filled and an average density of 120 pcf is used.

Offset per block, in:

Select this value from the drop down menu – it may be vendor dependent.

Batter, degrees:

This angle will be computed and displayed based upon offset and block height entered.

Hinge height, ft:

This will be computed and displayed based upon the formula Hh = (block depth) / (tangent of batter angle).

Wall Analysis Table:

Block:

Displays the total number of blocks

Ht. above base:

Displays block and layer heights in ft-inches and decimals.

Vert, N:

Accumulated vertical load from blocks above, at indicated height.

Lateral, static:

Displays lateral static force at each block height

Lateral, seismic: Displays lateral seismic force at each block height

Shear interface: Displays allowable shear at block interface per vendor equation. This equation is displayed under the block selection above.

S.F.:

Indicates safety factor based upon ratio of shear resistance at interface to lateral force at indicated level.

Base:

Displays total wall weight at bottom of wall.