# Earth Pressure Calculator

> Earth pressure calculation skill for retaining structures using classical and seismic methods

- Skill: `a5c-ai/earth-pressure-calculator` (Agent Skill)
- Install (CLI): `npx skillmds@latest add a5c-ai/earth-pressure-calculator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/earth-pressure-calculator/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/earth-pressure-calculator

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# Earth Pressure Calculator Skill

## Purpose

The Earth Pressure Calculator Skill determines lateral earth pressures on retaining structures using Rankine, Coulomb, and seismic methods for design of retaining walls and basement walls.

## Capabilities

- Active earth pressure (Rankine, Coulomb)
- Passive earth pressure
- At-rest earth pressure
- Surcharge effects
- Layered soil conditions
- Seismic earth pressure (Mononobe-Okabe)
- Sloping backfill effects
- Water pressure considerations

## Usage Guidelines

### When to Use
- Designing retaining walls
- Analyzing basement walls
- Evaluating excavation support
- Assessing seismic pressures

### Prerequisites
- Soil parameters available
- Wall geometry defined
- Surcharge loads identified
- Groundwater level known

### Best Practices
- Select appropriate theory
- Consider wall movement
- Include seismic where required
- Account for drainage

## Process Integration

This skill integrates with:
- Retaining Wall Design
- Foundation Design

## Configuration

```yaml
earth-pressure-calculator:
  theories:
    - rankine
    - coulomb
    - log-spiral
  pressure-states:
    - active
    - passive
    - at-rest
  seismic:
    - mononobe-okabe
    - wood
```

## Output Artifacts

- Pressure diagrams
- Force calculations
- Moment summaries
- Seismic increment values