×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Coulomb Earth Pressure

## Coulomb Earth Pressure

(OP)
Can coulomb active earth pressure be greater than 1.0?
For the case:
wall backslope from vertical = 45degree
wall backslope from horizontal = 45 degrees
retained soil backslope = 16 degrees
friction angle = 30
friction between wall and backfill = 14 degrees

I calculate Ka= 1.396

### RE: Coulomb Earth Pressure

Do you mean that the face of the wall is sloped (battered?) at 45 degrees while the retained soil behind the wall slopes upward at 16 degrees from the top of the wall? How can you have both 16 and 45 degree backslopes?

www.PeirceEngineering.com

### RE: Coulomb Earth Pressure

I didn't run any numbers yet because I want clarification from you. If phi = 0 degrees and the wall is leaning (battered) forward, Ka might be greater than 1.0. If the wall is plumb or leaning (battered) backwards, Ka should be <1.0.

### RE: Coulomb Earth Pressure

I'm having trouble understanding it too. We should be able to provide you with a response if you give us a sketch.

### RE: Coulomb Earth Pressure

avscorreia, where are your 45 degree backslope, 16 degree slope behind the wall, 14 degree wall friction (I see 13.5 degrees), and 30 degree phi angle? I don't see any of NBRY1's input.

www.PeirceEngineering.com

#### 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.

#### Resources

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
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!