×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Earth loading on a sewer line

Earth loading on a sewer line

Earth loading on a sewer line

(OP)
I’ve run into a situation where a PVC storm water line has to be installed in an area where the native soil is “muddy” with maybe a max. 100 psi E’ (soil modulus of elasticity)
I would like to use as bedding/backfill material 0.75” crushed rock.
The question is how wide the trench needs to be such way to prevent the crushed rock to be bushed away into the native soil and loose compaction?
Any formulas or real life experience?
Thank you

RE: Earth loading on a sewer line

You have not provided much information on the soil characteristics, depth of burial, or any external loads.  In poor soils,  care should be taken that the trench is constructed safely.  If you are concerned about migration of the granular backfill into the native soil, I would suggest using a geosynthetic fabric as a separator.

RE: Earth loading on a sewer line

You didnt indicate a size of pipe or distance to be traversed...a quick and dirty solution is to encase the pvc in steel pipe if it is just a relatively short crossing.

RE: Earth loading on a sewer line

Get the UniBell PVC Pipe Assoc. Handbook of PVC Pipe which has a very extensive design method for burying PVC pipe. Available on-line at http://members.aol.com/unibell/

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



News


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