Hardening Soil Model-value of power m

RE: Hardening Soil Model-value of power m

Jamal Hassan — Fri, 11 Feb 2022 16:35:31 GMT

I see Mr. Berk. Thank you very much.

RE: Hardening Soil Model-value of power m

Berk Demir — Fri, 11 Feb 2022 16:09:28 GMT

Hi Jamal, you have some problems with the understanding of embedded pile and I would strongly recommend you to take a look at the reference manual again. In the example you give, you have to enter 157 kN/m all along the length, not linear. Plaxis will multiply this value with the length of embedded beam. If you have 10 m pile, 1570 kN.

Since this question is on a different topic, I think we should stop discussing these here. Have a nice day.

RE: Hardening Soil Model-value of power m

Jamal Hassan — Fri, 11 Feb 2022 09:17:58 GMT

Thank You Mr. Berk. I got the english article and other publications from the same source. They are very informative. I have now understood that it is the characteristic values.

1. What about the side resistance input value. For example, for a 10 metres thick homogeneous clay soil with 100 kPa as cu value and the alpha approach has been seemed suitable for the site. The ultimate side resistance is, 0.5*100*3.142*1*10=1570. The input value can be suggested as linear with, 1570/10 which is around 0 kN/m top and 157 kN/m bottom. Is this okay?

2. When you have pile load test results to calibrate the embedded beam value characteristics, how does one go about this?

RE: Hardening Soil Model-value of power m

Berk Demir — Fri, 11 Feb 2022 07:51:44 GMT

What I tried to tell in that slide was always enter ultimate (characteristic values), because pile behaviour is non-linear, and you have to use characteristic values to simulate piles in Plaxi - to get the correct deformations.

RE: Hardening Soil Model-value of power m

Jamal Hassan — Thu, 10 Feb 2022 18:13:29 GMT

Thank You Berk for the reply. What about the embedded beam row? Do you input the bearing capacity divided by the factor of safety? And for side resistance do you take the allowable side resistance divided by length and input it in kN/m?

RE: Hardening Soil Model-value of power m

Berk Demir — Thu, 03 Feb 2022 13:35:50 GMT

You can find the English version here: berkdemir.github.io/.../

RE: Hardening Soil Model-value of power m

Stefanos Papavasileiou — Mon, 03 May 2021 18:15:48 GMT

Dear Umair,

I strongly advise checking the documentation about the Hardening Soil model. We also provide information in our Material Models manual.

The power m parameter is defining the amount of stress-dependency of the soil you are trying to simulate. Using a value of 1 means having a linear stress-dependency and a value of 0 means no stress-dependency of the stiffness.

Typically we do not recommend any values as this should be a product of laboratory investigation and based on the experience of the geotechnical engineer, however, for some clays, the value tends to be reaching a linear stress-dependency.
Please be aware that the response from soil to soil can, of course, be different, therefore any values that work for some users on one side of the world might not be relevant to other users.

RE: Hardening Soil Model-value of power m

Jamal Hassan — Sat, 24 Apr 2021 11:27:31 GMT

My advice to you is to check the manual or just type google the hardening soil model.You will see a pdf regarding each parameter. As per my understanding, I am with understanding 2 nad partly with understanding 1. That is for cohesionless soils a value of 0.5 is usually adopted. For clay soils, soft clays usually take the value in the order of 1 while stiff clays generally assume a value of 0.7. Of course, this will change with the change in stress paths and the type of soil you are dealing with. If you have a triaxial test, then you can calibrate it easily. I have a document but it is in Turkish and I even dont know the language. I hope someone would elaborate further. These are my own views, I hope it helps and someone well equipped with the matter can assist.

In the file below the author is explaining step by step, even has some information regarding embedded beams, which confuses me a bit, like the input values of a pile should be the ones divided by a factor of safety or the maximum values? for a pile in clay, which input values should be adopted when calculating using the alpha method (alpha*cu*perimeter*L or what exactly)?

source: www.researchgate.net/.../Basitlestirilmis-Kazikli-Temel-Hesaplama-Yoentemlerinin-Plaxis-3D-ile-Karsilastirilmasi-Hardening-Soil-Modelinin-Detaylarinin-Incelenmesi.pdf