GEO4 FEM - big projects, small price

 


 


The program is suitable for the modelling of common geotechnical problems such as terrain settlement , sheeting and supporting structures, slope stability, beams on elastic foundation, excavations etc...

Material models
A reliable and accurate response of a given soil or rock mass can be obtained by using a suitable material model. The present release offers the following material models: Linear elastic, Modified linear elastic, Mohr-Coulomb, Modified Mohr-Coulomb, Modified Cam-Clay. 

Corrector of a given geometrical model
The program contains a built-in corrector of the input geometrical model. All material interfaces, new structures or calculation stages (tunnel excavation, excavation of a foundation ditch) can be specified independently. Before running the mesh generator, the program automatically locates intersections of all specified lines, all closed regions and creates a corresponding geometrical model. Inputting even a complicated structure thus becomes a relatively simple task.

Automatic mesh generator
The program contains a built-in automatic mesh generator that considerably simplifies construction of the finite element mesh. Both 3-node and 6-node triangular elements are available. The density of the finite elements mesh is assumed constant for the entire model. Nevertheless, mesh adjustment by local refinement in the vicinity of a line or a point is available. Preparing a mesh for a complex structure thus requires only a few minutes of the user's time.

Boundary conditions

The program contains an automatic generator of boundary conditions. If needed, additional boundary conditions (fixed, hinge, spring, forced displacement) can be introduced anywhere in the soil body.
 

Beams
Beam elements serve to introduce beams, tunnel linings or sheeting structures into the analysis. As a result of the analysis, the program provides distribution of internal forces (bending moment, normal and shear forces) along the beams. The beam elements are added to the topology along existing lines. The beam parameters, however, can be adjusted in stages (e.g., gradually increasing beam thickness) or the beam can be terminated completely.


Anchors, struts, geotextiles, geogrids
The program allows the introduction of an arbitrary number of anchors in to the analysis. Each anchor is fully determined by its starting and end points and its stiffness. The anchor end points are automatically mapped on to the existing finite element mesh, so that the anchor can be placed anywhere within the soil body. To further simplify its input, the anchor starting point can be placed on the terrain or individual interfaces.

Surcharge

The program allows specification of an arbitrary number of surcharges (strip, trapezoidal, line loading). The surcharge can act either on a specified interface or anywhere in the soil/rock body. In the subsequent stage the existing surcharge can be either modified by changing its magnitude or entirely removed from the analysis.

Water

There are three options to introduce water into the analysis:

  1. The ground water table is input as a continuous interface above or below the terrain.

  2. The pore pressure values are provided by pore pressure isolines. The first isoline always coincides with the terrain, the other ones can be placed anywhere in the body. The values between individual isolines are found through linear interpolation.

  3. The values of coefficient Ru are provided by pore pressure isolines. The first isoline always coincides with the terrain, the other ones can be placed anywhere in the body. The values between individual isolines are found through linear interpolation.

Presentation of results
The program allows visualization of: Scalar variables in the form of isoplane or isolines (e.g., components of stress and strain fields and their invariants, displacements), deformed or undeformed structure, distribution of internal forces along the beams, vectors of deformation, forces in anchors. Either the total values of individual variables or their change from stage to stage can be displayed.

Stability analysis

At each stage of construction the program can carry out a slope stability analysis. In the course of the analysis the program gradually reduces the basic strength parameters of the soil until failure. As a result the program calculates a factor of safety corresponding to the one obtained from classical approaches.