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UC-1 Series Geotechnical Analysis
Geotechnical Finite element Elastoplastic Analysis Software(GeoFEAS)3D
3D stress - deformation analysis software using Finite Element Method (FEM)
Software price US$ 10,500
Academic price US$  4,800
Geotechnical analysis support service
Applicable to Windows NT/2000/XP/Vista

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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. GeoFEAS2D is designed for 2D geotechnical analysis (including axial symmetric analysis) and is being used widely. The performance we are developing following 2D and 3D program.
FORUM8 and Ukai laboratory have been engaged in joint development. The solver of this product utilizes the ground analysis program developed by Ukai laboratory, Department of Civil and Environmental Engineering of Gunma University and the Pre-Post processor is developed in-house and then coupled together as a total solution.

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Ver.2 Revised information

3D Geotechnical Finite element Elastoplastic Analysis Software(GeoFEAS)3D Ver.2
(Up&Coming '10 Mid Summer Issue)
  • Intersect creation function, the intersection surface between objects such as solid-solid, solid-surface, surface-surface, surface-line, and line-line can be created.
  • Grouping function, grouping of multiple objects which have same properties in one group.
  • Topographic data import(LandXML, DXF file)import, 3D coordinates and surface data in Land XML format can be imported.
  • Mesh dividing density specifying function, mesh creation function with tetrahedron elements of solid model.
  • Element examination simulation program
  • Improved analysis speed
    It takes about 30 minutes to analyze a model with 50,000 nodes per one stage with the spec of 4Gz Core2 CPU, 3G of memory, PC.
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Functions and features
Necessary of 3D analysis
Many engineers understand the importance of doing the elasto-plastic FEM analysis for nonlinear behavior of soil. Furthermore, the performance based design lead to geotechnical analysis using FEM has been increasing. While "GeoFEAS2D" is designed to conduct 2D analysis, "GeoFEAS3D" performs 3D analysis such as piles foundation, soil retaining work, effects of tunnel excavation to surrounding soil, and slope stability. In the series of geotechnical analysis of our company, the Solver was developed by professor Ugai and Fei CAI at civil engineering, Gunma University. Professor Ugai and Fei CAI have written various papers and presented the lectures regarding increasing need of 3D analysis.
Since conducting 3D analysis was considered to be extremely time-consuming and difficult to do even for engineers, 3D analysis has not been widely used yet. In respect to that, the Pre-processor (modeling including meshing) and the Post-processor (visualization and evaluation of result) should be easy to use and user-friendly. GeoFEAS3D was developed to perfectly meet these demands. Although 2D analysis has been commonly used in the past big projects, we believe that 3D analysis is the best solution tool in future.

Model creation and meshing
In the Pre-processor, we create a model, mesh model, and define stages.
Tunnel excavation image(Pre)
figure below indicates a meshed model (left)/load condition (right)

Tunnel excavated process (Pre)
The figures below indicate tunnel excavation process. It is very difficult to consider the effect of excavation on soil at the excavated direction by using 2D analysis, but we can consider it by using 3D model.

The Pre and Post processor were developed by Itech (French company) based on our specifications. The basic process is the same with GeoFEAS2D

Elements library
In 2D, soil element is modeled as a plane element, but in 3D we use solid element. 3D version supports tetrahedral, hexahedral and pentahedral element. Plane element has two types, one is plate element, and the other is shell element, but in the first 3D version, it supports only plate element. We can also define the structural elements (plate element, beam, truss, axial spring and shear spring element) to consider the interaction between the soil and the structure.

Element catalog Element type Support Note
Plane elements (Plate element) 3- node triangle element (linear) Plate element
4-node quadrilateral (linear) Plate element
6- node triangle (quadratic) Plate element
8-node quadrilateral (quadratic) Plate element
Solid elements 4-node 4- surface tetrahedral (linear)
10-node 4- surface tetrahedral (quadratic)
6-node 5-surface pentahedral (linear)
15-node 5-surface pentahedral (quadratic)
8-node 6-surface hexahedral (linear)
20-node 6-surface hexahedral (quadratic)
Line elements Beam (linear)
Truss (linear)
Axial spring
Shear spring
Joint elements 6-node plane joint element
8-node plane joint element
12-node plane joint element
16-node plane joint element

Joint element is used for contact between 2 planes.

Solid elements (tetrahedral, hexahedral, pentahedral)

Load and boundary condition
GeoFEAS is a total stress analysis software (not considering soil permeability for the current version). By considering the hydraulic pressure as nodal load, it can evaluate the effect of water lever variation on soil. It is possible to define: nodal load, uniform load, distributed and self-weight load (including seismic inertia load).Regarding boundary condition, you can define nodal constrain (horizontal and vertical rollers, fixed, pin, etc)、Multi points constrain(MPC, hinge), and assign nodal enforced displacement.User can change the material properties, load and boundary conditions at every stage (phase)

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 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.

Category Constitutive law Note
Elastic (1) Linear elasticity Isotropic
(2) Laminated elasticity Anisotropic
nonlinear elastic (3) Duncan 1 Use constant Poisson ration
(4) Duncan 2 Define volume coefficient
(5) D-min Technique by CRIEPI
Nonlinear (6) HD (Hardin-Drnevich)  
(7) RO (Ramberg-Osgood)  
(8) UW-Clay (Ugai-Wakai)  
Elastic-perfectly plastic (9) MC (Mohr-Coulomb) Associative/nonassociative flow rule
(10) DP (Drucker-Prager) Associative/nonassociative flow rule
(11) MC-DP (Mohr-Coulomb / Drucker-Prager) Nonassociative flow rule
Elasto-plastic (12) PZ-Sand (Pastor-Zienkiewicz)  
(13) PZ-Clay (Pastor-Zienkiewicz)  
No-tension (14) Linear elasticity  
(15) Laminated elasticity  

In the Post-processor, it is possible to visualize the model, contour, distributed charts. Some analysis results are shown below.

(1)Tunnel excavation: This figure indicates the deformation along excavated direction
Tunnel excavation analysis result
(Post of GeoFEAS3D)

(2)Piles group foundation analysis (1/4 model): This figure indicates the vertical settlement

Piles group foundation analysis result
(Post of GeoFEAS3D)

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