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Settlement of Pile Group

Settlement of Pile Group

Settlement of Pile Group

(OP)
I need to calculate the settlement of pile group  I found that some geotechnical publications said based on "equivalent raft concept", the total load is carried by a "equivalent raft" located at a depth of 2/3pile length and assumed the load spread from the perimeter of pile group at a slope of 1 horizontal to 4 vertical.  Below the raft the load is spread as a slope of 1 horizontal to 2 vertical. Could anyone explain how the 1:4 and 1:2 were defined.

Also I found some books does not consider the "equilvalent raft".  The total load spread at a slope of 1:2 begin at the depth of 2/3 pile length.  Which one is better for the calculation of pile group settlement?

RE: Settlement of Pile Group

The 60-degree method is the one that I am familiar with.  Calculate the area of the pressure influence at the mid-layer of the settling clay using a 60-degree projection from horizontal at 2/3rds of the pile length.  

Das's book has some more information on this.

RE: Settlement of Pile Group

The FHWA driven pile manual (HI-97-013) has diagrams and recommended methods to use depending on the soil profile assumed. Unfortunately, one of the text pages (9-122) describing the methodology was scanned incorrectly for the PDF version on the FHWA website. I have managed to parse the text and have a word file with my best shot at the correct text. I will try to send to SlideRuleEra and ask him to post on his site (with lots of other goodies) shortly. Let me know if anyone wants/needs it sooner.

Jeff

Jeffrey T. Donville, PE
TTL Associates, Inc.
www.ttlassoc.com

The views or opinions expressed by me are my own and do not necessarily reflect the views or opinions of my employer.

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