v6.01.116 SSNA116 - Triaxial test with the Hoek-Brown model modified axisymmetrically

Summary

This test makes it possible to validate the Hoek-Brown elasto-plastic behavior law modified in rock mechanics. It is a triaxial test for which the calculations are carried out only on the solid part of the soil in pure mechanics.

Two levels of confinement are applied: \(5\mathit{MPa}\) and \(12\mathrm{MPa}\). The parameters \({\phi }^{\mathrm{end}}\), \({\phi }^{\mathrm{rup}}\) and \({\phi }^{\mathrm{res}}\) are taken to be equal (which amounts to a constant volume plastic deformation): in this case it is possible to calculate an analytical solution to the problem and thus compare the results obtained with Code_Aster to this reference solution.

For reasons of symmetry, only one eighth of a sample subjected to a triaxial test is considered. The modeling is axisymmetric.

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Initial conditions, limits and loading
• 2. Benchmark solution
  • 2.1. Calculation of the reference solution
  • 2.2. Benchmark results
• 3. Modeling A
  • 3.1. Characteristics of modeling
  • 3.2. Characteristics of the mesh
  • 3.3. Tested sizes and results
• 4. B modeling
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested sizes and results
• 5. Summary of results