Settlement with a Soil Vapor Extraction System
Settlement with a Soil Vapor Extraction System
(OP)
I am currently working on a building that is remediating a PERC spill using a Soil Vapor Extraction System. While remediating, severe building settlement started happening around the column closest to the remediation. We know the column is pulling everything down with it but aren't sure exactly what is happening beneath the slab. We plan to excavate the column footing as there are other site problems that are coming into play but I was wondering if anyone else has experienced settlement when dealing with a Soil Vapor Extraction System? I have been researching the systems and find no data involving foundation settlement but find it hard to believe the installation of the system and the column movement are not linked somehow.
Thanks
Thanks





RE: Settlement with a Soil Vapor Extraction System
RE: Settlement with a Soil Vapor Extraction System
(I really like ausiegeoeng's explanation though. . .)
f-d
¡papá gordo ain’t no madre flaca!
RE: Settlement with a Soil Vapor Extraction System
RE: Settlement with a Soil Vapor Extraction System
Independent events are seldomly independent.
RE: Settlement with a Soil Vapor Extraction System
I understand most cleaning solvents are heavier than water, so, before that stuff comes up, chances are a bunch of water has to come along first. Did this system remove water? If so, look at possible action such as either increasing of soil unit density by taking away the buoyancy of that soil or by the drying of clays.
The solution might well be the coming in and injecting grout as with compaction grouting. Other treatments might be underpinning or mini piles with jacks, but the question is how deep are you affecting the supporting soil? Grout injection can go on until you have brought the column up and no further settling takes place.