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UC-1 Series Geotechnical Analysis
GeoFEAS Flow3D
  GeoFEAS Flow3D (limited to the seepage analysis) US$7,900
  GeoFEAS Flow3D (limited to the elasto-plastic ground analysis) US$10,500
3D stress - deformation analysis software using Finite Element Method (FEM)
Geotechnical analysis support service
Applicable to Windows Vista/7/8/10

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Elasto-plastic ground analysis by using FEM (GeoFEAS) and steady/unsteady saturated - unsaturated seepage analysis (VGFlow) are available in this geometric value analysis program.
In this program, GeoFEAS and VGFlow running on the same platform share geometry data and mesh data. This decrease a large amount of work for creating analysis models, which were made on each platform in the previous individual products.
The solver of this product utilizes the ground analysis program developed by the laboratory of ground engineering, Department of Civil and Environmental Engineering of Gunma University. The Pre-Post processor is developed in-house and they are coupled together as a total solution.
*This is an integrated product, but each product can be used separately.

Sharing of geometry and mesh

Functions and features
Creation of model geometry

Intersection creation
Intersections can be created between arbitrary objects like solid, surface, and line. even if many structures are intersected intricately.

In 3 dimensions, the number of objects becomes larger than that of 2 dimensions, and model editing becomes more difficult. Grouping of plural objects with the same property value makes it possible to select many objects in a lump and assign material constant.

Display/hiding and confined selection of objects
In the complex 3D model, only the object that you want to edit can be displayed. You can also make a selection from the each of the confined objects of materials, surfaces, and solids.

Import of the terrain data in the LandXML format
You can now import the 3 dimensional coordinate data and its connection information of the point clouds on the ground surface or on the stratum boundary created in LandXML format. Complex terrain information can be built automatically without manual entering, and object structure can also be modeled from the information.

Terrain created from LandXML file Display/hiding and confined selection of objects

Realistic modeling of the objects like complex terrain and crossed tunnel that can be handled only by the 3 dimension analysis is also available.

Mesh division
Mesh is divided semiautomatically. First, set the number of divisions of block line. The line can be divided at regular intervals or in the specified ratio. Surface is parted into triangle or rectangle, and solid is parted into tetrahedron or pentahedron. Model mesh is parted easily even after the number of division has been changed.

Element library
Solid elements are used for the ground modeling. Tetrahedron, pentahedron, and hexahedron element are available in this product.

Solid elements (tetrahedron, hexahedron, and pentahedron)

Post processor

Contour figure and plane cut of that
About GeoFEAS
GeoFEAS3D is '3D Geotechnical Finite element Elasto-plastic Analysis Software'. It is the software product for 3D stress-deformation analysis of soil under static conditions. This FEM product can be used for the elast-plastic analysis in a lot of ground related field such as a pile foundation analysis, earth retaining excavation analysis, tunneling shield, and slope stability analysis.

Applied for
- Stress and deformation analysis of the ground - Tunnel construction study analysis in NATM method
- Slope stability analysis - Study of the effect of changes in the water pressure on the ground
- Retaining excavation analysis - Study of the interaction between ground and structure
- Analysis of the effect to the surrounding ground during the tunneling shield excavation - Seismic response method

Functions and features

Stage analysis
material constant, boundary conditions, and stress release rate during the excavation can be set for the each step of the stage analysis (construction step analysis).

Shear strength reduction method
At each analysis stage, you can calculate overall safety rate by shear strength reduction method and estimate the slip surface. The method can be applied to the 3 full elasto-plastic models.

Local safety rate
This is calculated for each integration point.

Combination of analysis functions
Using some analysis functions together, you can execute the deformation analysis and stability analysis at the same time for a variety of problems related to ground, such as excavation and embankment, and slope stability, support force.

Mixture of the constitutive law
This can be provided to each material.

Type of analysis
Static total stress analysis

Load conditions
This is a program that analyze total stress without regarding permeability phenomenon of the ground.
Considering water pressure as nodal load, you can study the influence to the ground exerted by the change in water pressure.
As load types, you can consider node concentrated load, uniformly distributed load, distributed load, and volume load (own weight and static seismic).

Element catalog Structure models Support
Concentrated load Nodal concentrated load Yes
Distributed load Linear distributed load, plane distributed load Yes
Own weight Horizontal acceleration, vertical acceleration Yes
Distributed load Constant horizontal load in depth, constant vertical load in depth Yes
Horizontal seismic intensity distributed in depth,
vertical seismic intensity distributed in depth
Water pressure Water pressure on node Yes

Boundary conditions
single point constraint (horizontal roller, vertical roller, fixed, and pin), multi-point constraint (MPC, hinge), and forced displacement are available. Material constant and boundary condition can be set in each stage.

Constitutive law
The most basic method of stress-deformation behavior analysis of soil is using elasto-plastic analysis. It is necessary to select proper element types, constitutive laws, etc.
GeoFEAS Flow has 15 constitutive laws for soil and structure from the simplest linear elastic constitutive law to elasto-plastic constitutive law. No-tension material is also available. In the Processor, it is possible to perform both deformation and stability analysis at the same time by combining stage and SSR analysis, and to deal with a wide range of soil related problems such as filled/excavated area, slope stability and bearing capacity, etc.

Model types Structure models Note
Elastic (1) Linear elasticity Isotropic
(2) Laminated elasticity Anisotropic
Non elastic (3) Duncan 1 Use constant Poisson ration
(4) Duncan 2 Define volume coefficient
(5) D-min Technique by CRIEPI
Non-linear (6) HD (Hardin-Drnevich)
(7) RO (Ramberg-Osgood)
(8) UW-Clay (Ugai-Wakai)
full elasto-plastic (9) MC (Morh-Coulomb) Associative/nonassociative flow rule
(10) DP (Drucker-Prager) Associative/nonassociative flow rule
(11) MC-DP (Mohr-Coulomb / Drucker-Prager) Nonassociative flow rule
Elaso-plastic (12) PZ-Sand (Pastor-Zienkiewicz)
(13) PZ-Clay (Pastor-Zienkiewicz)
No-Tension (14) Linear elasticity
(15) Laminated elasticity

You can apply bi-linear model to the bar element and the spring element, and Mohr-Coulomb method to the joint element. Linear elastic model can be applied to the beam, bar, spring, and joint element.

Output items

Result type Result
Contour figure Displacement
Max. shear stress
Increment of Max. shear stress
Compressive stress
Tensile stress
Local safety rate
Total safety rate (only for SSR analysis)
Tensor Solid element stress
Solid element strain
Section force of the plate element
bending moment of the plate element
About VGFlow
  Saturated/unsaturated seepage analysis program using Finite Element Method (FEM) is based on the analysis solver produced by the Prof. Ugai laboratory (Department of engineering, Gunma university). This product has been developed by customizing VisualFEA as pre and post parts. It provides easy ways to generate two and three dimensional (2D and 3D) complicated shaped geological boundary models, and several functions such as regular meshing, auto-meshing and re-meshing by setting types and dimensions of elements. Stationary and transient analysis can be conducted in 2D vertical, 2D axisymmetric, horizontally 2D and 3D models using several boundary conditions.

Applicable scope

- Check of the rainfall influence against road banks
- Influences of rainfall and spring in large basin
- Measures of seepage surface and water pressure distribution in river levee
- Design calculation of fill type dam body and investigation of seepage on the ground around reservoir
- Examination of permeability in the basic process like curtain grouting
- Design calculation of dam body of reservoir and one for disaster prevention
- Examination of piping and boiling during excavation
- Influences of confined groundwater
- Effect of drainage well on pore pressure distribution in landslide region 
- Investigation of seepage in cofferdam 

Functions and features

Analysis Type
Steady flow analysis / Transient flow analysis

Analysis Model
3D flow model

Boundary Conditions
This product can define the following seven types of boundary conditions and set fluctuating water level and rainfall boundaries at the same time.

- Known hydraulic head - Point source
- Known flow - Fluctuating water level
- Leaching - Rainfall
- Outflow forbidden

Unsaturated seepage characteristics

  1. van Genuchten model
  2. Volumetric water contents θ - Suction ψ, and Volumetric water contents θ - Relative hydraulic conductivity Kr

Library of the material parameter

Output items

Result type Result
Contour figure  Pressure head
Pore water pressure
Fractional saturation
Volume water content
Hydraulic gradient
Current speed vector
Tensor Current speed vector
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