×
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

Related Articles

Jobs

Soldier Piles on sloped ground

Soldier Piles on sloped ground

Soldier Piles on sloped ground

(OP)
I got a new design that I have not come acrossed yet before. The client wants a soldier pile system to temp shore an access path for construction vehicles into a already graded excavation site. The slope of the already graded site is 1.5:1 (H:V). The exposed shored wall is already at 10' high but the resistant soil is sloping 1.5:1 away from the face of the shoring. See attached photo for clarification. My question is how much soil do I need as resistant soil. Calculate enough to counter the force? I have a feeling this will be 20'+ leaving the entire soldier beam as 30'+ long. What are your thoughts?
http://files.engineering.com/getfile.aspx?folder=41ae8f88-98dd-4a63-9fd5-9ab124d6a06a&file=shoring_2.pdf
http://files.engineering.com/getfile.aspx?folder=68288f59-d0a6-4bcc-91b0-56d1b87b7844&file=shoring.pdf

RE: Soldier Piles on sloped ground

Don't forget you will need a horizontal working platform for the drilling rig.

RE: Soldier Piles on sloped ground

(OP)
Correct obviously tie back is the only option for this situation. I have never done one with a decreasing passive area. I am still pretty much a greenhorn to designing shoring( I submit my designs to the senior engineer and he approves them so dont worry :) ) Would anyone have an example of this situation? The above reference mentions the situation and how it reduces the passive loads but I am having a hard time finding references on how it directly effects it.  

RE: Soldier Piles on sloped ground

Bowles has a method of computing passive resistance in descending slopes. In general, embedment is about 1.3H for flat backfill and no surcharge.  In your case, it may approach 1.6H +/-, so you 20 ft is on the safe side.  For your case, you also need to check for daylight distance.  Try achieving H/3 and a minimum of 10 ft of daylight distance as measured from the tip of the drilled pier. H is the slope height. Don't forget your traffic surcharge.

RE: Soldier Piles on sloped ground

(OP)
I will have to check it. I just checked it for using apparent earth pressures in which the book does not contain any information about. I think as for safety I will be using Ko (at-rest) coefficient due to the traffic loads that it will be exposed to D8's 10 yd concrete trucks and the soil being class C and they only want 1/2" deflection at most so I am thinking rigid therefore my reasoning to use Ko. Any thoughts?

RE: Soldier Piles on sloped ground

You really need to contact your Geotech on this one and get his recommendation.  

Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
 

RE: Soldier Piles on sloped ground

FixedEarth - What is daylight distance?

Thanks.

EIT

RE: Soldier Piles on sloped ground

Daylight distance is the horizontal distance from the bottom of the pier tip to the outside face of the slope ( where you can see daylight :))  For structures in or near slopes, we go by IBC figure which asks for H/3. Sometimes this H/3 is say 6 ft, so I always ask a minimum of 10 ft.

RE: Soldier Piles on sloped ground

Makes sense, thanks.

EIT

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!


Resources


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