{
  "version": 1,
  "soils": [
    {
      "name": "Clean Gravel",
      "gamma_dry": 120.0,
      "gamma_sat": 135.0,
      "phi_deg": 38.0,
      "cohesion": 0.0,
      "description": "GW/GP, well- to poorly-graded clean gravel."
    },
    {
      "name": "Gravelly Sand",
      "gamma_dry": 115.0,
      "gamma_sat": 130.0,
      "phi_deg": 36.0,
      "cohesion": 0.0,
      "description": "SW with gravel, dense."
    },
    {
      "name": "Sand",
      "gamma_dry": 110.0,
      "gamma_sat": 125.0,
      "phi_deg": 33.0,
      "cohesion": 0.0,
      "description": "SP/SW clean sand, medium dense."
    },
    {
      "name": "Silty Sand",
      "gamma_dry": 110.0,
      "gamma_sat": 125.0,
      "phi_deg": 30.0,
      "cohesion": 100.0,
      "description": "SM, sand with non-plastic fines."
    },
    {
      "name": "Sandy Silt",
      "gamma_dry": 105.0,
      "gamma_sat": 120.0,
      "phi_deg": 28.0,
      "cohesion": 200.0,
      "description": "ML with sand, low plasticity."
    },
    {
      "name": "Silt",
      "gamma_dry": 100.0,
      "gamma_sat": 120.0,
      "phi_deg": 27.0,
      "cohesion": 300.0,
      "description": "ML, low plasticity inorganic silt."
    },
    {
      "name": "Lean Clay",
      "gamma_dry": 100.0,
      "gamma_sat": 120.0,
      "phi_deg": 24.0,
      "cohesion": 500.0,
      "description": "CL, low to medium plasticity clay."
    },
    {
      "name": "Fat Clay",
      "gamma_dry": 95.0,
      "gamma_sat": 115.0,
      "phi_deg": 20.0,
      "cohesion": 800.0,
      "description": "CH, high plasticity clay."
    },
    {
      "name": "Engineered Fill",
      "gamma_dry": 125.0,
      "gamma_sat": 135.0,
      "phi_deg": 34.0,
      "cohesion": 0.0,
      "description": "Compacted granular fill, 95% of max dry density."
    },
    {
      "name": "Weathered Rock",
      "gamma_dry": 140.0,
      "gamma_sat": 145.0,
      "phi_deg": 42.0,
      "cohesion": 1000.0,
      "description": "Highly weathered residual rock; treat as dense soil."
    }
  ]
}