Bored Piling

[ake71]

If the pile toe levels has been exceeded by more than 500mm or so, what is the best rectification for this:
I have thought about a few options but advise would be great:
* pour in concrete to the toe level
* do nothing as the desirable toe level has been passed and therefore has met the piling requirement.

Any ideas would be greatly appreciated.
Thanks
AKE

 

[hokie66]

It is very unusual to have bored piles specified to found at a given level. Usually, where you stop drilling depends on the conditions encountered at that location. Commonly, bored pile lengths vary considerably across a site.

 

[ake71]

Thanks
I have a set of drawings which shows the toe levels. It has already been determined during the design phase which included geotech assessments.
So my question is that during actual construction what happens if the toe level has been exceeded? Is this an actual issue or can that be rectified?
Thanks
ake

 

[hokie66]

Ask the geotechnical engineer or the structural engineer. They will probably tell you to just place the additional concrete when you fill the pile.

 

[Okiryu]

Look at the boring logs for the area close to that pile. Also, in my area we don't use too much bored piles for the medium sized buildings I work with, but I have read that typically, the shaft friction contribution is greater than the toe resistance contribution, so you may be ending up doing nothing as you are gaining slightly additional capacity due to that extra pile length.