> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/retaining-wall-workflow/earth-pressure-rw/retaining-wall-earth-pressure-eh-ls-rw.md).

# Retaining Wall Earth Pressure (EH / LS) \[RW]

Generates the lateral earth pressure acting on the wall stem — either the horizontal earth pressure (EH) from the retained soil, or the live load surcharge (LS) represented as an equivalent height of soil.

## General

**Wall Segments:** The wall segments the earth pressure is applied to.

**Stage:** Construction stage at which the pressure is applied.

**Load Type\[Earth Pressure (EH)=0/Live Load Surcharge (LS)=1]:** Selects which load is generated — the earth pressure from the retained soil, or the live load surcharge (default: Earth Pressure (EH)=0).

**Active Earth Pressure Coefficient (Ka). Default 0.283 = (1-sin34)/(1+sin34).:** Rankine active earth pressure coefficient. The default corresponds to a 34-degree friction angle (default: 0.283).

**Backfill Soil Unit Weight (Caltrans default 120 pcf):** Unit weight of the retained backfill soil (Caltrans default 120 pcf).

**Live Load Surcharge Equivalent Soil Height (Caltrans default 2 ft = 24 in):** Height of soil used to represent the live load surcharge. Applicable when Load Type is Live Load Surcharge (default: 24).


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