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Need some advise regarding sheet pile design

Need some advise regarding sheet pile design

Need some advise regarding sheet pile design

(OP)
Hi friends,

   I am working on a sheet pile design project. The height of the sheet pile is 2 to 3 feet. Approximately 11 feet high, 1.5 to 1 reinforced slope is planned for construction behind the sheet pile. The contractor wanted to drive sheet piles in order to minimize the encroachment of buffer zone. my question is, do I need to consider the weight of entire 11 feet high fill material as surcharge for pile design? Or, becuase the sheet pile is only 2 to 3 feet, is it OK if I consider the surcharge load upto 4 t 6 feet behind the sheet pile?  If hard/rock encounters shallow depth (say 4 or 5 feet below dredge line), is it ok to terminate the driving sheet pile at that elavation? I will really appreciate if somebody can adivse me on this.
 

RE: Need some advise regarding sheet pile design

You need to consider the effect of the slope. Although you can compute the effect of the surcharge above the top of the sheet, a simpler way is to use modifed active and or passive coefficents for the ground slope. These can be found in a table, or if the geometry is not simple, can be computed by a Cullman's Diagram.You need to establish a certian toe elevation for a cantilevered sheet. If you can not get that you will need to brace or tie back the sheet.

As a VERY rough apoproximation, if you say half the height of the slope would be equivelent to level backfill, your sheeting ht is 2.5=5.5=8 ft. A 4-5 foot toe would require very dense or stiff materials. For medium dense or medium stiff clays, You may need more toe. However, you should run your own numbers.

RE: Need some advise regarding sheet pile design

(OP)
Thank you DRC1. I considered the loading in the way you explained. I got 12 to 14 feet of pile penetration. the reason for that is the N values varies from 2 to 5 at many locations. The hard or dense material was enountered at approximately 6 to 18 feet below the dredge line. If they cannot penetrate through the hard materail, can they stop driving the anchor further. I heard about socketing the pile into the hard material once. I do not have details how it works. Could you please let me know if you have any information on this.

Thanks again for your response.

 

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