Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


calibration of mohr coulomb and/or hypoplasticity material model

calibration of mohr coulomb and/or hypoplasticity material model

calibration of mohr coulomb and/or hypoplasticity material model

I would like to derive material parameters based for a simulation which will implement the mohr coulomb and/or hypoplastic material model based on the following information:

• Heavily overconsolidated
• Very dense, fine sand
• In situ preconsolidation pressure of 1 MPa
• Bulk unit weight of 20 kN/m3
• Relative density 100%
• Groundwater table 6 m below piling platform level
• In situ water content ranging between 10-12%
• Degree of saturation = 71%
• D50 (mean particle size) between 0.1 and 0.15 mm

I also have averaged CPT information with friction sleeve and end resistance as a function of depth. Unfortunately I don’t have information about the dimensions of the CPT apparatus used.

I am new to constitutive models and the calibration of their parameters. Therefore I would like to ask, where can I start in terms of calibrating the parameters?


RE: calibration of mohr coulomb and/or hypoplasticity material model

You need soil laboratory test data, prepared at the conditions you state, to calibrate your model against. You have to run a single element driver for the appropriate test boundary conditions and match the response with the response from the lab test.

For the soil you describe, you are unlikely to get a good match using those constitutive models. It may therefore be a case of ensuring you match the critical features for your analysis.

RE: calibration of mohr coulomb and/or hypoplasticity material model

1. If you are new to numerical modeling, you have a long road ahead of you.
2. What software are you using? Most numerical questions need to be framed around what software platform is being used, and which program (2D or 3D)
If Plaxis, then use the "Soil Test" feature to check your theoretical constitutive model behavior against lab results.
3. A Mohr-Coulomb (primarily bi-linear) model will be much simpler, quicker, and much more forgiving than any non-linear (usually hyperbolic) model. If you're new to this, stick with MC for a while.
4. I've found that populating a parameters table before you start is a helpful reference (in a single view), and makes model input more systematic. Like this (taken from a Plaxis tutorial example):

Good luck

RE: calibration of mohr coulomb and/or hypoplasticity material model

what's the end game? Slope stability? Shoring design?


ípapß gordo ainÆt no madre flaca!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Research Report: State of IoT Adoption in Product Development 2019
This research report, based on a survey of 234 product development professionals, examines the current state of Internet of Things (IoT) adoption by product design teams, its perceived importance, and what features and capabilities teams consider important when making decision about adding IoT functionality to their products. Download Now
Research Report: Augmented Reality for Maintenance, Repair and Overhaul (MRO)
The term Industry 4.0 denotes a cluster of technologies that’s poised to fundamentally reshape manufacturing and bring about a new industrial revolution. These include 3D printing (AM), the Industrial Internet of Things (IIoT), artificial intelligence (AI) and mixed reality technologies, more commonly known as virtual reality (VR) and augmented reality (AR). Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close