×
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.

# Coefficient of Friction

## Coefficient of Friction

(OP)
HI,

I am looking to calculate the lateral loads applied from a pit of manure. Do I follow the normal procedure as if it was normal backfill where i can search for the coefficient of friction? Is there a coefficient for manure? Thank you!
Replies continue below

### RE: Coefficient of Friction

You may be able to obtain information from an agricultural department. Back in first year engineering, my cousin was studying agricultural engineering at the U of Man. I had a crest fabricated using the same logo as the faculty of Architecture, but with Agriculture on it...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

### RE: Coefficient of Friction

Are we talking solid or liquid manure? Also, is the structure below grade?

In general, if we are talking about a below grade structure, the worst case condition will be when it is empty and only dealing with structural loads on the exterior wall due to the later pressure of the soils (possibly hydrated) and induced loads due to traffic.

If we are talking about a solid manure pile on a above grade structure, the worst case condition would be the manure piled up along the structural wall of the building (note, you may be required to maintain a freeboard (e.g., 0.5') and not stack to the rafters. A 3 (horizontal):1 (vertical) slope is a conservative estimate for any piles of manure (or at least that is what Indiana uses) for determining maximum volume of wastes in an area.

### RE: Coefficient of Friction

This could be a mixture of relatively stiff straw and more solid errrr horse shit or could ba complete liquid gloop like you get underneath a slatted shed with cow effluent.

So I think you need to look at both extremes, I.e. a pile of manure which could stand up as a heap, so an internal friction angle of maybe 25 or 30 degrees or one which is essentially heavy water.

I doubt that manure behaves in anything similar to a pile of aggregate and is probably plastic in nature and settles over time creating more dense material than when it starts. So again look at two extremes if you can get the data.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

#### 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.

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!