Pipe-Soil Friction Angle

[ahijazi]

Does anybody know where I can find Pipe-Soil Friciton Angle Tables for different pipe materials and soil types.

 

[rconner]

What is the intended use of this information (if it is for determining how much pipe to restrain from pressure thrust at various thrust foci, DIPRA provides recommendations for this at e.g.

http://www.dipra.org/pdf/thrustRestraint.pdf)?

 

[rconner]

[The DIPRA recommendations are of course for ductile iron pipe.]

 

[ahijazi]

Thank you for the DIPRA catalog link, but I am looking for other pipe materials such as RCCP and PVC.

 

[dgillette]

ahijazi - You can find some of that info in NAVFAC DM-7. (In the '75 edition, it's Table 10-1.)

For formed concrete (which I assume includes RCCP) against...

Clean gravel or gravel-sand mixtures - 22 to 26 degrees
Clean sand or silt-sand-gravel mixture - 17 to 22
Fine sandy silt or NP silt - 17

For steel sheet pile, probably similar to steel pipe, the numbers are generally 3 degrees lower.

For PVC, no numbers were provided, but seems to me they could be real low.

Does this help? A newer edition might have PVC.

DRG

 

[ahijazi]

dgillette,

Thank you for that reference.

I found the table you referred to on page 86 at this link:

http://web.mst.edu/~rogersda/umrcourses/ge441/DM7_02.pdf

Do you have any idea how I can get an updated source that has Plastic or PVC listed becuase this was last updated in 1986?

Thanks Again

 

[RWF7437]

http://plasticpipe.org/index.html

 

[vie]

A lot of pipe specs I see for smooth outside pipes limit the maximum slope to 10%. I'd go with a corrugated outside pipe steeper than 10%. Then you could get back to soil to soil friction as the soil fills the corrugations.

You'll need to consider hydraulic issues with pipes sloped more than 10%. Maybe thrust blocks on every joint.

You never said why you are needing the info. What's the application?

David