The following are an integrated suite of five geotechnical software packages being used extensively throughout the world on six continents and in more than 70 countries. They are used by practicing engineers for the analysis and design of a wide variety of structures and by universities for teaching and research. The five state-of-the-art software packages for geotechnical modeling in the Microsoft Windows environment are:

- SLOPE/W for slope stability
- CTRAN/W for contaminant transport
- SIGMA/W for stress and deformation
- TEMP/W for geothermal analysis

Other features of the finite-element software include:

- Four- to eight-noded quadrilateral elements
- Three- to six-noded triangular elements
- Infinite elements for far-field boundary conditions
- Selectable Gaussian integration order
- Color shading of elements according to material type
- Display of boundary conditions as graphic symbols
- Boundary conditions specified as functions for transient analyses
- No inherent restrictions on the number of nodes and elements
- No restriction on the nodal number difference (bandwidth) in an element

SEEP/W analyzes ground-water seepage and excess pore-water pressure dissipation problems. The comprehensive formulation of SEEP/W makes it possible to consider analyses ranging from simple saturated steady-state problems to sophisticated saturated/unsaturated time-dependent problems.

Many computed parameters such as head can be contoured, and the relative rate of flow can be displayed as velocity vectors.

- Steady-state and transient flow conditions
- Confined and unconfined flow
- Two-dimensional flow in a vertical plane
- Three-dimensional axisymmetric flow
- Two-dimensional flow in plan view

- Constant hydraulic head and/or flux conditions
- Transient head and/or flux as a function of time
- Flux as a function of computed head
- Review and automatic modification of seepage face conditions

Boundary conditions can be specified as a function of time. Convergence can be viewed graphically while a problem is being analyzed.

Hydraulic conductivity is dependent on the negative pore-water pressure in the unsaturated zone.

SEEP/W has a powerful graphing feature that plots a variety of parameters as a function of time or space, i.e., you can plot pore-water pressure distribution along a vertical section through the mesh or plot pore-water pressure changes with time at a given node. The graph data can be imported into another application such as a spreadsheet for further analysis or for preparing presentations.

The migration of a wetting front can be displayed as a transient water table plot.

- Dissipation of excess pore pressure after reservoir drawdown
- Changes in pore-water pressure conditions within earth slopes due to precipitation infiltration
- Mounding of the ground-water table beneath water retention structures such as lagoons and tailings ponds
- Effect of subsurface drains and injection wells
- Drawdown of a water table due to pumping from an aquifer
- Seepage flow quantities into excavations

Computed values such as head, pressure, velocity, gradient, and conductivity can be plotted as a function of time or space.

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