연구의 선진화와 생산성 향상에
필요한 최적의 소프트웨어와 컨설팅을
공급하도록 노력하겠습니다.
 
 

Comprehensive and Powerful

SIGMA/W is a finite element software product that can be used to perform stress and deformation analyses of earth structures. Its comprehensive formulation makes it possible to analyze both simple and highly complex problems. For example, you can perform a simple linear elastic deformation analysis or a highly sophisticated, nonlinear elastic-plastic effective stress analysis.
The many constitutive soil models allow you to represent a wide range of soils or structural materials. In addition, when coupled with SEEP/W, SIGMA/W can model the pore-water pressure generation and dissipation in a soil structure in response to external loads.
These features enable SIGMA/W to analyze almost any stress or deformation problem you will encounter in geotechnical, civil, and mining engineering projects.
 

Typical Applications

SIGMA/W can model almost any stress/deformation problem, including:
  • Settlement of footings, fluid-filled tanks, or earth structures
  • Deformation within or underneath an embankment or earth dam
  • Closure around a tunnel
  • Lateral movement of braced or anchored excavations and surface settlement around the excavation
  • Floor rebound of open-pit, sloping excavations
  • Volume changes (uncoupled consolidation or heave) resulting from pore-water pressure changes
  • Staged fill placement, earth removal
  • Soil-structure interaction, including free un-bonded anchors, cross excavation struts, and trusses
  • Fully-coupled consolidation analysis
  • Simulation of tailings deposition
  • Permanent deformations resulting from strength loss
  • Strength reduction stability
  • 이외에 더 많은 기능들이 있음
 
(큰 이미지 보기 ☞ click)
 

Features

  • Analysis types include drained total and effective stress, undrained total and effective stress, 2D plane strain, 3D axisymmetric, consolidation and swelling, and insitu stress
  • Constitutive soil models include linear-elastic, anisotropic linearelastic, nonlinear-elastic, elasticplastic, and Modified Cam-clay
  • Boundary condition types include X and Y displacements, forces, pressures, and spring constants, as well as self-weight gravity loading
  • Structural beam and bar elements for soil-structure interaction
  • Staged loading for fill placement or earth removal
  • Un-coupled volume change due to pore-pressure changes
  • Fully-coupled stress-pore pressure analyses
  • User Add-In constitutive models
  • Undo and redo commands
  • 이외에 더 많은 기능들이 있음
 

Formulation

SIGMA/W is formulated for 2-dimensional plane strain or axisymmetric problems using a small displacement, small strain, incremental load formulation. For each load step, incremental displacement at each node resulting from the incremental load is computed and added to the displacement at the beginning of the load step to give the total displacement. For soil models with nonlinear material properties, SIGMA/W solves the equations iteratively using the Newton-Raphson technique; soil properties are updated every iteration until a converged solution is achieved.
You can simulate the filling and excavation of materials by activating or deactivating finite elements at various stages of the construction process. SIGMA/W can be used with SEEP/W for un-coupled consolidation analyses. SEEP/W calculates transient
pore-water pressure changes due to the applied load, while SIGMA/W calculates deformations resulting from the pore-water pressure changes.