Severely Settling Sidewalk
Severely Settling Sidewalk
(OP)
I am designing a repair for a severely settled sidewalk. In some locations the sidewlak has settled in excess of 4". There is a sanitary sewer that runs undernesth the sidewalk for its full length. We have sent a robot through the line but have not detected any signs of leakage. My approach has been to propose demolishing the existing sidewalk, installing a Geotextile membrane, a QP base then pouring 4" of new sidewalk.
My thinking is that the membrane will help to stabilize the underlying soil while the QP will provide a firm base.
Any thoughts on this approach?
My thinking is that the membrane will help to stabilize the underlying soil while the QP will provide a firm base.
Any thoughts on this approach?





RE: Severely Settling Sidewalk
RE: Severely Settling Sidewalk
RE: Severely Settling Sidewalk
RE: Severely Settling Sidewalk
But still, I'd say that settlement most always means poor subgrade - fix that first before you put another sacrificial lamb-slab on top of it.
RE: Severely Settling Sidewalk
Let us know about the pipe exploration.
RE: Severely Settling Sidewalk
RE: Severely Settling Sidewalk
If the joints are tight, then I don't know what the problem is. It could be settlement, though that is unlikly on this old of a pipe. You might want to post this question in the Geotechnical engineering other topics form and see if anyone has any better answers. At this point I would say that recompacting 3 or 4 feet of the sewer backfill directly under the pipe would be purdent.
RE: Severely Settling Sidewalk
RE: Severely Settling Sidewalk
If the failed area is relatively short (<200m, average block length where I am)
Demolish the footpath (its buggered anyway), ecavate the trench, over the sewer and backfill it with a compacted stable material and rebuild the footpath. Problem solved.
regards
sc