Boulders and foundations
Boulders and foundations
(OP)
Hi. first time on the boards and i have a question.
There was a soils report done on a site and it said the boring logs were terminated because it hit boulders. The boulders went from 4.5ft to 6.5ft below the surface. The client wants to build retaining walls and some of these retaining wall foundations will land/cross the location of these borders but will not be in contact with them.
Would there still be a problem with building the foundations if the bottom of the foundations were about 2ft above the boulders? If it isn't possible, how would i get around to building the foundations of the walls?
Thanks for any future input.
There was a soils report done on a site and it said the boring logs were terminated because it hit boulders. The boulders went from 4.5ft to 6.5ft below the surface. The client wants to build retaining walls and some of these retaining wall foundations will land/cross the location of these borders but will not be in contact with them.
Would there still be a problem with building the foundations if the bottom of the foundations were about 2ft above the boulders? If it isn't possible, how would i get around to building the foundations of the walls?
Thanks for any future input.





RE: Boulders and foundations
Since construction of the footing will expose the boulders where present, you may use there also some additional steel in the wall and footing to forestall any effects of differential settlement; only very long continuous walls -on very stiff supports, out of differential stiffness- should make that steel a significant amount.
RE: Boulders and foundations
Not much help, eh. . . ?
f-d
¡papá gordo ain't no madre flaca!
RE: Boulders and foundations
Re-emphasizing fattdads points, the borings need to be viewed in the context of site geology.
Based upon your comments you seem fairly certain that boulders will only be encountered in a certain area of the project over a very specific depth range. I would point out that you cannot know this from the boring logs alone. Hopefully there is some degree of interpretation that went into this assumption based upon the presumed origins of the boulders.
RE: Boulders and foundations
RE: Boulders and foundations
Mike McCann
MMC Engineering