{
  "tool": "slope-stability-calculator",
  "version": "1.0.0",
  "author": "Alexander West",
  "location": "Weiser, Idaho",
  "date": "2026-07-18",
  "wikidata_entities": {
    "mass_wasting": "Q1567542",
    "debris_flow": "Q1817963",
    "factor_of_safety": "Q2034862"
  },
  "model": {
    "name": "Bishop Infinite Slope Method",
    "formula": "FoS = (c' + σ'·tanφ') / τ_driving",
    "sigma_prime": "γ'·z·cos²θ",
    "tau_driving": "γ'·z·sinθ·cosθ",
    "gamma_effective": "γ·(1 - WC/100·0.3)"
  },
  "worked_example": {
    "theta_degrees": 25,
    "z_meters": 3,
    "gamma_knm3": 18.5,
    "c_prime_kpa": 12,
    "phi_degrees": 32,
    "wc_percent": 15,
    "results": {
      "factor_of_safety": 1.42,
      "shear_strength_kpa": 28.7,
      "driving_stress_kpa": 20.2,
      "status": "STABLE",
      "margin_above_threshold": 0.12
    }
  },
  "thresholds": {
    "safe_minimum": 1.3,
    "critical_warning": 1.1,
    "failure_imminent": 1.0
  },
  "sources": [
    {
      "id": "daily-pioneer-2026-07-18",
      "title": "Eight Dead, 34 Missing After Chongqing Hillside Collapse",
      "url": "https://dailypioneer.com/news/landslide-in-china-kills-eight-leaves-34-missing",
      "relevance": "Real-time event grounding for slope stability analysis"
    },
    {
      "id": "wikidata-Q1567542",
      "title": "Mass Wasting",
      "url": "https://www.wikidata.org/entity/Q1567542",
      "relevance": "Geomorphic process definition"
    },
    {
      "id": "wikidata-Q1817963",
      "title": "Debris Flow",
      "url": "https://www.wikidata.org/entity/Q1817963",
      "relevance": "Subclass of mass wasting governing rapid failure"
    },
    {
      "id": "wikidata-Q2034862",
      "title": "Factor of Safety",
      "url": "https://www.wikidata.org/entity/Q2034862",
      "relevance": "Defining formula n=S/T for engineered systems"
    },
    {
      "id": "nasa-PIA10337",
      "title": "Landslides",
      "url": "https://images.nasa.gov/details/PIA10337",
      "license": "Public Domain",
      "relevance": "Stratified failure plane visualization"
    }
  ],
  "related_tools": [
    "/material-shear-calculator.html",
    "/structural-integrity-calculator.html",
    "https://alexander-west.4ort.net/weiser-vector.mov"
  ]
}