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Geomechanics Blog Posts

Analyzing Slope Stability Through the Shear Strength Reduction Method

May 28, 2019

Dams that are poorly designed or constructed are likely to fail. However, geotechnical engineers can account for the stability and reliability of a dam long before the structure is even built.

Analyzing Triaxial Testing Methods for Geomechanics

March 5, 2018

Triaxial testing of soil is important when determining the structural stability of a tunnel, dam, or building. Geomechanics simulation can help ensure that triaxial testing methods are up to par.

Predicting Deformations in a Bank Protection Structure with Simulation

April 3, 2017

To predict how a bank protection structure within the Yangtze River in China would deform under certain conditions, a group of researchers turned to geomechanical analysis.

Can a Stiffness Be Negative?

December 5, 2016

In finite element modeling, you may encounter formulations where a force does not monotonically increase with displacement. You can see this property in many material models that include degradation of the material. Such behavior is represented by a negative stiffness. In this blog post, we discuss some examples of negative stiffness, including the physical backgrounds and numerical implications. These ideas are not confined to mechanical analysis, even though the term stiffness originates in that field.

Investigating Damage to Cultural Heritage Sites with Simulation

May 3, 2016

Why are the famous paintings on the walls of a Netherlands chapel deteriorating? To answer this question, researchers from the Eindhoven University of Technology used physical measurements and simulation to evaluate how rising moisture affects the chapel’s artwork. Today, we’ll see how their research helped provide a better understanding of the damage occurring within this cultural heritage site.

Testing the Safety of Reinforced Concrete Beams with an App

December 17, 2015

Reinforced concrete beams are commonly used in modern construction due to their strength and durability. To avoid failure, each new beam design needs to be optimized and tested for safety. Building physical prototypes to test every design modification can be a long and costly endeavor. Simulation apps offer a solution, saving time and money as they bring simulation power into the hands of more people. Explore the benefits of this approach with our Parameterized Concrete Beam demo app.

Introducing Nonlinear Elastic Materials

January 9, 2015

Nonlinear elastic materials present nonlinear stress-strain relationships even at infinitesimal strains — as opposed to hyperelastic materials, where stress-strain curves become significantly nonlinear at moderate to large strains. Important materials of this class are Ramberg-Osgood for modeling metals and other ductile materials and nonlinear soils models, such as the Duncan-Chang model.

Yield Surfaces and Plastic Flow Rules in Geomechanics

October 16, 2014

In order to ensure safe geotechnical building methods, specific applications require certain foundations and structure reinforcements. Tests are quite expensive to carry out, so simulation can be really useful and even essential. Many numerical models have been developed to give a deep insight into soil behavior. Here, we introduce the most widespread models for soils available in COMSOL Multiphysics and analyze a tunnel excavation example.


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