×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Need ansewr to the following Question

Need ansewr to the following Question

Need ansewr to the following Question

(OP)
As per Indian Code, we have Settlement vs. N value in semilog plot given in the code.
Can any one tell  me the exact emprical/mathmetical formula which brings up thiese semilog plots as given in the code.

RE: Need ansewr to the following Question

Krishnendu,
My answer mainly assumes sandy conditions.  I would tend to not want to use a canned plot of settlement vs. N value for settlement analysis.  There are many site specific items that are used to complete a settlement analysis which include N value among other items such as structure type and usage, other underlying soils types for which the Standard Penetration Test (SPT) N Value may not be applicable, etc.  Structure size, type, soil/structure interaction, and usage is a very important consideration in the final settlement estimate that deserves more attention than it is usually given.

I've found the best way to deal with settlement issues in Sandy soils is to take the N values and make a good estimate of relative density based on the existing overburden pressure, sand type, and SPT methods using an appropriate relationship such as the one provided by Gibbs and Holtz.  When you have the best estimate of relative density, you can make a good estimate of the modulus or compressibility of the soils.  This infomation can be used directly in most well-known settlement analyses.  It should be noted that soil type affects the N value very much.  Coarse sand or gravel can raise the N value artificially high.  Pore pressures developed during the SPT in silty sands can raise or lower the N value remarkably.  The idea is to look at all aspects of the project to get "the best" estimate(s) for settlement.  So to answer your question directly, your charts were developed with many assumptions so I wouldn't be able to give you the mathematical relationship between the two.  Please let me know if any of this helped.

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! Already a Member? Login


Resources

White Paper - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now
eBook - Simulation-Driven Design with SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. 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