Strain-controlled compressive test – (Post-peak stress-strain behavior)

Strain-controlled testing in rock samples is a method used to post-peak stress behavior of the rock, as well as other mechanical properties by applying a controlled amount of deformation (strain) to a rock sample and measuring its response (such as changes in strength, stiffness, and deformation). The test can be done uniaxially (UCS) or triaxially (TCS).

This process allows scientists and engineers to understand how a rock will behave under different loading conditions, such as during an earthquake or underground mining, where the manipulation of the rock mass changes the inherent mechanical properties of the same.

The benefits of strain-controlled testing include:

  • Improved understanding of rock behavior: By measuring the rock’s response to different strain rates, scientists and engineers can better understand how it will behave in a variety of natural and man-made conditions.
  • Better prediction of rock failure: By determining the rock’s strength and deformation characteristics, engineers can better predict when and where rock failure may occur.
  • Improved design of underground structures: By understanding the behavior of rock in response to different loads, engineers can design underground structures, such as mines and tunnels, that are more stable and safer.
  • Improved understanding of natural processes: Strain-controlled testing can also be used to study natural processes, such as the deformation of rock during an earthquake, which can help scientists better understand these events and improve hazard assessments.