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UC-1 Series Geotechnical Analysis
Geotechnical Finite element Elastoplastic Analysis Software
(GeoFEAS)2D Ver.3
Software price US$ 6,500
Academic price US$ 2,170

Stress deformation analysis program of the ground with Finite Element Method (FEM)
Japanese/English versions

Geotechnical analysis support service
Geotechnical analysis support service

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Applicable to Windows NT/2000/XP/Vista
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GeoFEAS 2D is `2D Geotechnical Finite element Elastoplastic Analysis Software´. It is the software product for stress-deformation analysis of soil under static conditions. This software conducts the powerful elasto-plastic finite element analysis in many engineering fields such as slope stability analysis, earth retaining works excavation analysis, tunnel design, etc. This product consists of three programs, (1) preprocessor, (2) processor, and (3) postprocessor. Finite element analysis conditions are created in preprocessor as CAD software. Elasto-plastic problems are analyzed in processor. Also analysis results are processed for visualization in postprocessor.
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.


New product introduction

Paper /Presentation

Seminar: Japan and abroad

Ver.2 What has changed (December 5, 2008 Released)
Related Page GeoFEAS2D Ver.2 2009河川耐震性能照査指針(案)対応
(Earthquake resistant river structure standard, Up&Coming 2008 late fall issue, Japanese)

  1. New functions: Analysis of deformation by misalignment by gravity at the time of liquefaction, Calculation of deformation amount by compressed volume after liquefaction 河川構造物の耐震性能照査指針(案)・同解説(March 2007)

    Check flow of Analysis of deformation by misalignment by gravity Result of Analysis of deformation by misalignment by gravity(by Post processor)

  2. SXF generation tool was added to import luster image(TIF、BMP、JPEG、GIF)

  3. Addition and extension to Post processor
    • Maximum shearing strain distributed figure
    • Displaying the number of selected node, element, beam element from output of numerical value
    • Display of mesh-cut for making figure
    • Random setting of load scale
    • Displaying result of selected elements: by rectangular, by element
    Deformation figurer by Post processor:
    displaying the result of selected elements

Functions and features
Corresponding analysis category
 # Static total-stress analysis

Corresponding analysis models
 # Plane strain analysis
 # Axisymmetric analysis

Main features

# Stage analysis
The stage analysis, or the phased construction analysis can be performed. It is possible to change material parameters, boundary conditions, and stress release factors at each stage.

# Shear strength reduction (SSR) analysis
The shear strength reduction (SSR) analysis can be performed using three kinds of elastic-perfectly plastic constitutive laws. It is possible to evaluate global safety factor and slip surface by SSR analysis at each stage.

# Local factor of safety
It is possible to calculate the local safety factors at each Gaussian point.

# Coordination with seepage analysis
It is possible to use nodal water pressure loads from seepage analysis (Note: This is for the analysis using load module).

# Combination of stage and SSR analyses
It is possible to perform both deformation and stability analyses at the same time by combining stage and SSR analyses, and to deal with a wide range of soil related problems such as filled/excavated area, slope stability, bearing capacity, etc.

# Mixed assignment of constitutive laws
It is possible to assign different constitutive laws for each material.

Boundary conditions
It is possible to define the following four boundary conditions.
 # Supporting point (horizontal and vertical rollers, fixed, pin, enforced displacement)
 # Multi point constraint (MPC)
 # Spring supporting point
 # Pin connection

Element libraries
It is possible to define the following finite elements.

Category Element 2D Axisym-metric Note
Line Beam o - First order element
Bar o - First order element
Axial spring o - Including spring supporting point
Shear spring o - Including spring supporting point
Torsion spring x -  
Distributed axial spring x -  
Distributed shear spring x -  
Surface Three-node triangle o o First order element for 2D & axisymmetric analyses
Four-node quadrilateral o o First order element for 2D & axisymmetric analyses
Six-node triangle o o Second order element for 2D & axisymmetric analyses
Eight-node quadrilateral o o Second order element for 2D & axisymmetric analyses
Joint Four-node line joint o o Apply between 2D first order elements
Six-node line joint o o Apply between 2D second order elements
o: supported, x: unsupported.

Constitutive law models
# Constitutive law models for elements in plane strain and axisymmetric analyses
It is possible to use the following constitutive law models for elements in plane strain and axisymmetric analyses. Linear and laminated elasticity models can be used as no-tension materials.

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  

# Constitutive law models for beam, bar, spring, and joint elements
It is possible to use the following constitutive law models for beam, bar, spring, and joint elements.

Element Constitutive law Support Note
Beam(M- ) (1) Linear elasticity o  
(2) Bi-linear x x  
(3) Tri-linear x x  
Bar (1) Linear elasticity o  
(2) Bi-linear o  
(3) Tri-linear x  
Spring (1) Linear elasticity o Including spring supporting point
(2) Bi-linear o Including spring supporting point
(3) Tri-linear x  
Joint (1) Linear elasticity o  
(2) MC (Mohr-Coulomb elastic-perfectly plasticity) o  
o: supported, x: unsupported.

It is possible to use the following loads.
 # Nodal force load (2D, axisymmetric)
 # Uniform pressure load (2D, axisymmetric)
 # Defined-per-node pressure load (2D, axisymmetric)
 # Self weight load (2D, axisymmetric)
 # Seismic inertia load (2D)
 # Nodal water pressure load (2D, axisymmetric)

GeoFEAS2D can take into account water pressure, but not soil permeability.

Postprocessor (After-treatment)
Output analysis of processor (Analysis section) is processed.Output / confirmation of result figures and numerical values are carried out.
In this program, the following can be output mainly.
 # Model figure
 # Deformation figure
 # Vector diagram
 # Contour figure
 # Distribution map
 # Numeric output

Combination with the UC-1 Earth retaining work design (Option)
In Temporary sheathing work design, it allows examining the effect to surrounding ground by "enforcement displacement method" which works vertical overburden pressure on the bottom of excavation if needed, giving the FEM analysis model that modeled only ground to the displacement of earth retaining wall from elastoplastic analysis as enforced displacement.
Elastoplastic result of
Temporary sheathing work
Earth retaining work FEM
(Input screen of the forced displacement method)
Earth retaining work FEM
(Contour figure of the forced displacement method)

Applicable scope
This product is mainly applicable to the following problems.
 # Stress-deformation analysis of soil
 # Slope stability analysis
 # Earth retaining works excavation analysis
 # Analysis of surrounding soil effect by shield tunnel construction
 # NATM tunnel construction analysis
 # Study of water pressure variation effect on soil
 # Study of soil-structure interaction
 # Ground response acceleration method

 # Potts, D., Axelsson, K., Grande, L., Schweiger, H. and Long M.: Guidelines for the use of advanced numerical analysis, Thomas Telford, 2002.
 # Zienkiewicz, O. C., Chan, A. H. C., Pastor, M., Schrefler, B. A., and Shiomi, T.: Computational Geomechanics with Special Reference to Earthquake Engineering, John Wiley & Sons Ltd., Chichester, 1999.
 # Zienkiewicz, O. C. and Taylor, R. L.: The Finite Element Method - Fourth Edition -, Volumes 1 and 2, McGraw-Hill, 1989.

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