Application | PLAXIS 2D PLAXIS 3D |
Issue status | ✔ Solved |
First Affected Version | PLAXIS 2D 2010 PLAXIS 3D 2010 |
Found in Version | PLAXIS 2D 2010 PLAXIS 3D 2010 |
Fixed and Released in Version | PLAXIS 3D 2018.00 |
Issue # | SW-26547 |
Date created | 29 March 2018 |
Date modified | 28 January 2019 |
In the description of the Hoek-Brown model, the definition of the mobilized dilatancy is a function of σ’3 based on two input parameters ψ and σψ.
However, internally, this definition is not followed for PLAXIS 2D 2018 (and earlier) and PLAXIS 3D 2017 (and earlier). Instead, the evolution function shown in red in Figure 1 is used.
This means, with the standard setting, you will not see any dilatancy effect in the tension zone, since the defaults settings are ψ = 0° with σψ = 0 kN/m2, see Figure 2.
This issue is now solved since PLAXIS 2D 2019 and PLAXIS 3D 2018.00: the dilatancy behaviour based on the confining stress σ'3 now follows the description in the manuals:
For older versions (PLAXIS 2D 2018 and earlier, PLAXIS 3D 2017 and earlier):
When you want to get similar behaviour as described for the standard behaviour (ψmob = 90° at σ'3 = σt, and ψmob = 0° at σ'3 = 0 kN/m2) you need to define these parameters: ψ close to 90 ° and σψ = 0 kN/m2.