Chemical grout on organics
Chemical grout on organics
(OP)
Experts,
I am working on a remediation plan (sinkhole) of a property in which the shallow soils (4 to 6 ft) are composed of organics.
As part of the remediation plan, I was going compact grouting and in the top 10 feet chemical grout. Since chemical grout doesn't work in soils with high amount of fines (organics), do you think that by only underpinning the whole property it could be enough?, or do you know if there is any alternative to this?
Please let me know,
Thanks
I am working on a remediation plan (sinkhole) of a property in which the shallow soils (4 to 6 ft) are composed of organics.
As part of the remediation plan, I was going compact grouting and in the top 10 feet chemical grout. Since chemical grout doesn't work in soils with high amount of fines (organics), do you think that by only underpinning the whole property it could be enough?, or do you know if there is any alternative to this?
Please let me know,
Thanks





RE: Chemical grout on organics
I don't know what sort of volume you are looking at and there is the possibility that some of the grout will work its way through the organic material.
Dik
RE: Chemical grout on organics
RE: Chemical grout on organics
Thanks for your comments.
The problem is that at this time, the organics are between 8 and 10 feet deep. when we grout (compaction grouting), we grout up to 10 feet below ground surface to avoid heaving.
So pretty much, the organic issue remains.
Chemical grout doesn't work in high fine contents.
RE: Chemical grout on organics
RE: Chemical grout on organics
1 - Yes, I can start injecting (grouting) below the organic layer, that is not a problem.
2 - Yes, the plan is to do both Underpining + compaction grouting. I understand your comment when you say "If chemical grouting does not work for the organic soils, it does not matter because you will underpin". Based, on your comments, then what is the point of chem grout then?. Most of sinkhole solutions around my area use Underpin, compaction grouting and chemical grout.
I know that compaction grouting is usually done up to 10 ft below ground level, in order to avoid heave. That means that there are 10 ft of soils "unimproved", but again, yes, if underpins are being placed, then i don't see the point of improving the top 10 ft as the structure will be supported by the underpins.
In case, the improvement is only compaction grout, and no underpins, that's a different situation. In that case, I do understand that Chem grout will play a critical role as the top 10 ft will need to be improved.
3 - It is a structural slab.
Thanks
RE: Chemical grout on organics
RE: Chemical grout on organics
Dik