×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

shear strength of subbase under gravel road
2

shear strength of subbase under gravel road

shear strength of subbase under gravel road

(OP)
what is the best way to calculate the stress' on a subbase under a 3 layer gravel road bed, i.e., 6" of 3/4"-0, over 9" of 1-1/2" -0, over compacted subbgrade (60,000 lb load).  Is the 3 layer theory as stated in Yoder/ Witczak (principles of pavement design, 2nd edition) valid for this particular case?  Also, when I calculate the stress in the subbase, where would I find typical values of shear strength in various soil types for comparison? Can anyone tell me where I can find typical values for the modulus of elasticity for compacted granular backfill and or various compacted soil types?

thank you in advance.

RE: shear strength of subbase under gravel road

2
The elastic layer process given in Yoder and Witczak is valid for your problem.  There's even "public domain" program that will easily compute these stresses for you (ELSYM 5).

I'm not sure why you want to check the shear stress in the subgrade under a pavement.  I assume you have your reasons, but it is not one of the controlling factors in a pavement analysis.  You need to look at vertical deformation at the top of the subgrade, as this parameter controls rutting, not the shear strength of the soil (though all are interrelated).  There are several correlation values for vertical deformation at the top of the subgrade.  Commonly used state Departments of Transportation values are Kentucky, California, etc.  Both Shell and Chevron have correlation values as well.

RE: shear strength of subbase under gravel road

(OP)
Thanks for the info ... where might I find "ELSYM 5" on the net ...

thanks in advance

RE: shear strength of subbase under gravel road

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


Resources

White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. 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