Expand Structural Analyses for Geotechnical Applications with the Geomechanics Module

Simulation Software for Modeling Nonlinear Mechanical Behavior in Soil, Concrete, and Rock

Analyzing tunnels, excavations, slope stability, and retaining structures requires nonlinear material models tailored for geotechnical applications. The Geomechanics Module is an add-on to the Structural Mechanics Module that includes built-in material models for modeling deformation, plasticity, creep, and failure in soils, concrete, and rock. The module also includes standard nonlinear material models to describe metal plasticity through the von Mises and Tresca criteria.

In addition to the built-in material models, you can enter user-defined yield functions and input your own mathematical expressions of the field variables, stress and strain invariants, and derived quantities using equation-based modeling. You can also define material properties that are dependent on another variable, such as a computed temperature field or water pressure.

To accurately account for real-world effects and behavior in your geotechnical analyses, you can include multiphysics effects by combining the features and functionality in the Geomechanics Module with other modules in the COMSOL® product suite. For instance, you can model porous media flow, poroelasticity, solute transport, and heat transfer with the Subsurface Flow Module.

Material Models Available in the Geomechanics Module

Soil Plasticity

  • Mohr–Coulomb
  • Dilation angle
  • Drucker–Prager
  • Elliptic cap
  • Tension cutoff
  • Matsuoka–Nakai
  • Lade–Duncan

Elastoplastic Soil

  • Modified Cam–Clay
  • Modified structured Cam–Clay
  • Extended Barcelona basic
  • Hardening soil


  • Ottosen
  • Bresler–Pister
  • William–Warnke
  • Tension cutoff


  • Original Hoek–Brown
  • Generalized Hoek–Brown
  • Tension cutoff


  • Von Mises
  • Tresca


  • Volumetric
  • Deviatoric
  • Potential
  • User defined


  • Equivalent strain criterion
  • Rankine
  • Smooth Rankine
  • Norm of elastic strain tensor
  • User defined
  • Regularization
  • Crack band
  • Implicit gradient

Nonlinear Elasticity

  • Ramberg–Osgood
  • Hyperbolic Law
  • Hardin–Drnevich
  • Duncan–Chang
  • Duncan–Selig
  • User defined

Simulation Applications: Customize Inputs and Outputs for Streamlined Design

The Application Builder, included in COMSOL Multiphysics®, enables you to build simulation applications that further simplify the simulation workflow by enabling you to restrict the inputs and control the outputs of your model so that your colleagues can run their own analyses. Working with specific soil, rock, and concrete models, this functionality is especially useful for testing how different materials affect a simulation.

With specialized applications, you can easily change a design parameter, such as a geometrical dimension, material property, or boundary load, and test it as many times as you need without having to know the inner workings of the software. You can use applications to run your own tests more quickly or distribute applications to other members of your team to run their own tests, further freeing up your time and resources for other projects.

The process is simple:

  1. Transform your geomechanics model into a specialized user interface (a simulation application)
  2. Customize the application to your needs by selecting inputs and outputs for the application users
  3. Use the COMSOL Server™ or COMSOL Compiler™ deployment products to make applications accessible to other team members
  4. Enable your team to run their own design analyses without further assistance

You can expand the capabilities of simulation throughout your team, organization, classroom, or customer base by building and using simulation applications.

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