The modeling of unsaturated soil processes such as seepage, contaminant transport, stress, and thermal analysis all require information on unsaturated soil property functions. SoilVision provides you with the benefit of experimental data on over 5,000 soils. The knowledge of experts has also been incorporated to provide interpretation and predictive capabilities to the system.

SoilVision offers a level of estimation of soil parameters and unsaturated and saturated soil property functions never before available incorporating an easy-to-use Windows interface, a database of unprecedented detail, and a knowledge-based system. As a result, numerical modeling was never so easy!

SoilVision is a database knowledge-based system which assists in the estimation of saturated and unsaturated soil properties.

<Ι>Modeling: SoilVision provides state-of-the-art data and prediction algorithms to provide input to finite-element and finite-difference programs for modeling of seepage, stress analysis, contaminant transport, thermal analysis, and volume change of soils.

<Ι>Data Storage: SoilVision is built around a database system and therefore provides an excellent method of organizing and tracking soils data. Soil information can be stored and organized by project, texture, geographic location, or other significant fields.

- Database of over 5,000 experimentally-measured soil-water characteristic curves, 600 grain-size curves, 2,500 saturated permeabilities and 250 permeability curves
- Prediction of soil-water characteristic curve from grain-size distribution
- Mathematical estimation of unsaturated soil property functions from soil-water characteristic curves
- Plotting of soil correlations
- Extremely comprehensive set of soils data
- Estimation of soil properties for saturated and unsaturated soils
- Rule Base allows automatic prediction of missing soil properties
- Database allows storage and retrieval of geotechnical soils data

- Dams
- Embankments
- Slope stability analysis
- Pipeline engineering
- Highway design and maintenance
- Design of earth covers and liners
- Infiltration and evaporation

A variety of types of soils information is also available. Soil information covering every USDA textural classification is available. In addition, many soils are also grouped by soil series, soil family, horizon, horizon depth, or Atterberg limits. Included in SoilVision is waste rock and mining tailings soils data obtained from research performed at the University of Saskatchewan involving mine sites.

- Grain-size
- Consolidation and compression
- Wetting soil-water characteristic curve
- Drying soil-water characteristic curve
- Permeability
- Water Storage coefficient
- Shear strength
- Specific heat capacity
- Thermal conductivity
- Frozen soil-water characteristic curve
- Diffusion

In summary, the dataset contains over 5,000 soils. This includes experimental data for 5,000 soil-water characteristic curves, 600 grain-size curves, 2,500 saturated permeabilities and 250 permeability curves.

Comparisons can easily be made between property functions because SoilVision allows the plotting of multiple functions. An example of this is the plotting of several drying soil-water characteristic curves grouped by the same textural classification. Multiple soil property functions can also be plotted for any of the other functions represented in SoilVision.

The following table shows the soil property functions that can be fit and the type of equation with which they are fit:

## Soil Property Function | ## Mathematical Representation |

Grain-size distribution | Modified Fredlund & Xing |

Consolidation or compression curve | Modified Fredlund & Xing |

Wetting soil-water characteristic curve | Fredlund & Xing van Genuchten Mualem Burdine Gardner Brooks & Corey |

Drying soil-water characteristic curve | Fredlund & Xing van Genuchten Mualem Burdine Gardner Brooks & Corey |

Thermal conductivity curve | Modified Fredlund & Xing |

Frozen soil-water characteristic curve | Modified Fredlund & Xing |

Diffusion curve | Modified Fredlund & Xing |

## Soil Property Function | ## Prediction Method |

Drying soil-water characteristic curve | M. D. Fredlund's Method |

Saturated permeability | Hazen's Method Cozeny-Carmen Method |

Permeability function | Campbell's Method |

Shear strength function | Fredlund & Xing's Method |

Water storage function | Derivative of soil-water characteristic curve |

Unfrozen water content function | Patrick B. Black's Method |

Specific heat function | Omar Farouki's Method |

Thermal conductivity function | Johansen's Method |

Diffusion function | Lim & Barbour's Method |

The prediction of the drying soil-water characteristic curve from the grain-size distribution and volume-mass properties is unique to SoilVision. The prediction technique allows successful estimation of the unsaturated properties of a soil knowing only the easily-measured grain-size and volume-mass mechanical properties. This is valuable due to the high cost of experimentally measuring the soil-water characteristic curve. The prediction of the soil-water characteristic curve has been found to work successfully for Sands, Silts, Loams, Clay's and a variety of other soils. Examples of the estimation of the soil-water characteristic curve can be seen below:

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