Contact US

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!

*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

Bowles rock bearing capacity

Bowles rock bearing capacity

Bowles rock bearing capacity

Joseph Bowles in his book "foundation analysis and design fifth edition",in bearing capacity of rock,he multiplies bearing capacity obtained from terzaghi'equation by RQD^2 to obtain ultimate bearing capacity.
1)is this multiplication applicable for all modes of failure?or only for global shear failure?for e.g compressive failure and splitting failure.
2)doesn't global shear failure depends on orientation of jointing?if this is true is it taken into consideration through the use of RQD?

RE: Bowles rock bearing capacity

Bowles used a lot of the publications and writings of others in his publications. I suspect his text has notations as to publications that he used and that may be enough for you to resolve the questions..

RE: Bowles rock bearing capacity

2. Adverse jointing would only be applicable if the structure was founded on a rock slope / cutting where the dip angle and dip direction of the rock joint were in the same plane as the cutting.

RE: Bowles rock bearing capacity

thank you.
When jointing is vertical and opened,compressive failure(like buckling)is likely to be the mode of failure.what I want is to determine bearing capacity of this failure mode,using cohesion and friction angle obtained from high pressure triaxial test and RQD.

RE: Bowles rock bearing capacity

What type of structure is planned? High-rise? Light-weight structure? dams foundation? For buildings, you may not need to report the "real" rock capacity, rather, you may just need to give an allowable bearing pressure so the structural engineer will be very confortable to work with...which the rock will be able to provide...

Anyway, check with your local engineering offices....you can verify your numbers against the typical used numbers for rocks in your area...

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


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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