RE: Eur > 2*E50 in HSM model

Dennis Waterman — Tue, 04 Jul 2023 12:13:23 GMT

Dear Pauline,

The explanation is that even for sands Eur > E50 because primary loading is more elasto-plastic than unloading/reloading, hence the stiffness in primary loading is always lower than in unloading/reloading. For numerical reasons Eur = 2*E50 is the lower limit, but since generally Eur > 3*E50 this is not a practical limitation.
Eur = E50 means the soil behaviour is purely elastic. I won't say that is never true (never say never when it comes to soil), but as Berk already mentioned, in that case you can just use the Mohr-Coulomb model.

With kind regards,

Dennis Waterman

RE: Eur > 2*E50 in HSM model

Berk Demir — Tue, 04 Jul 2023 11:38:03 GMT

That's Mohr-Coulomb. That's the main difference between MC and HS.