Greetings,
I am facing trouble on applying the Barton – Bandis model in UDEC 7 latest version (105).
First of all I had trouble on assigning the B-B model in certain set of Joints. I would get the following message:
“Cannot use Barton-Bandis joints with this version of UDEC”
I sort of overcame that issue by using the change command and moving forward by changing constitutive model to 7 (B-B) to the sets that I wished. Although it worked initially now that I am trying to re-apply it going back to the same step (i.e. sav file) I am getting the same message again.
“Cannot use Barton-Bandis joints with this version of UDEC”
Before building the model I have used the respective command for B-B:
“block config barton-bandis”
Finally, I should note that I wish to use both Mohr Coulomb and Barton – Bandis in my analysis.
I am doing something wrong?
Any suggestions would be highly appreciated.
Michael
Further to the above question, I have just been playing with the B-B example model provided with UDEC v7 install. It is not possible to plot the JCSo as a property of the joint plane, but when selecting to plot the JRCo of the joint plane, it instead shows the value for the JCSo property.
Please could this be looked into @udecsupport ?
You need to use the command:
config Barton-Bandis at the beginning of your data file.
The plotting issue with jcso has been identified and an update will be posted as soon as possible.
1 Like
Thank you for the response.
As I described in my first message, I already used this command.
There seems to be some inconsistencies with the Barton – Bandis model in UDEC 7.
To be more specific:
1. Once I complete the geometry (including the command barton – bandis configuration) if I make a save at that point and try to continue later by defining the properties I get an error that “Barton – Bandis cannot be used in this version of UDEC”. It is as if it loses somehow the configuration of the Barton – Bandis model.
My work – around on this is to actually include in the same save file the geometry and the setting of properties, however in older versions (UDEC 6) this was not the case
2. If I use Mohr- Coulomb on some joints and afterwards try to change the constitutive model (with the respective properties) it will not allow me giving me the same response “Barton – Bandis cannot be used in this version of UDEC”. This also was not the case in older version of UDEC. You could change constitutive models and properties to the model as you pleased, which was quite convenient to be honest.
3. Finally, I seem to have numerical instabilities with my model. I cannot seem to get the stresses correct (mainly the sxx stresses are “bleeding” through the joints) in consolidation, unless I use very high normal stiffness, which however are not the realistic values of the shear and normal stiffness for my joint set. I have to be x10^2 to 10^3 higher in order to have my stresses correct.
Is there any work-around on this and staying “true” to the properties of the joint-sets…?
Looking forward for any responses / suggestions.
You need to send the data files that produce this problem to udecsupport@oneitasca.com. Please also include you UDEC serial number.
Great thanks will do.
I have sorted out the first two questions however the third is still an issue I think..
