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How to set the parameters of JCFpmMat?

Asked by William

Hi, everyone!

I have read some literature to figure out how to set the parameters of JCFpmMat, especially the tensileStrength and the cohesion. However, I still have some problems.

The tensileStrength and cohesion parameters in [1] (t=16MPa, c=16MPa) and [2] (t=4.5MPa, c=45MPa) are different.

I wonder that on what basis is the ratio of tensileStrength to cohesion set and how to set their value range? Why the parameters in the two papers differ widely?

[1]https://link.springer.com/article/10.1007/s00603-017-1397-6
[2]https://www.sciencedirect.com/science/article/pii/S1365160912000391

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Luc Scholtès
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Best Luc Scholtès (luc) said : 		#1

Hello William,

Please read this paper:

https://www.sciencedirect.com/science/article/pii/S0022509612002268

There is a section (4) where a calibration procedure is proposed. Careful, there is typo in table 3 where the C value for the granite should be equal to 160 MPa and not 1600 MPa.

Basically, the tensile strength T and cohesion C values have to defined in relation withe the degree of interlocking (coordination number / interaction radius). From my experience, with the right coordination number, the C/T ratio of the BPM can be defined equal to the ratio compressive strength / tensile strength of the rock you want to model.

Luc

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William (qfxx-123) said : 		#2

Thanks Luc Scholtès, that solved my question.