Intersection creation

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

Group

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 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.

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

▲Solid elements (tetrahedron, hexahedron, and pentahedron)

▲Contour figure and plane cut of that

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

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).

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.

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

• 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

Type of analysis

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
• Known flow
• Leaching
• Outflow forbidden
• Point source
• Fluctuating water level
• Rainfall

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

This program includes the default value for 10 kinds of soil and the library of unsaturated seepage characteristics written on the guideline for structural examination of river embankment.

Output items