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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

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