Wildlife crossing near joe's smoke ring.
Setting up to do some deformation monitoring.
Just doesn't look like there is enough cover over that corrugated steel to develop the necessary strength. Not sure what conclusion you can reach after deformation monitoring that you can't reach right now. I think the job you need to be doing is a roadway topo about 1500' in both directions so the road can be raised a few feet.
Concretus Termitus Infestation
Apparently you have allowed the bug man to be lax in his spraying duties. The common Concretus Termitus is well known for causing such problems when allowed to breed indiscriminately.
I suppose you have signs at each end of the crossing locations directing the wildlife to the proper paths to follow as they continue their journeys to the next such crossing location. Are these in English?
this is a poor photo angle - there's probably 6 ft of cover at subgrade shoulder. the pipe is skewed about 15^ which causes the headwall/ pipe at the failed portion to have minimal cover....
Concretus Termitus Infestation
we put up 6' high wildlife fence... it's beautiful....:-|
The fault in the pavement has gone all the way thru and is forcing the tinhorn to fail.
Too much compacting?
😉
My 2 cents worth... from the pics.
I would say that the steel is peeling away due to the (assumption, no north side movement) South side exposure and the thermal co-efficient difference between steel and concrete.(un-educated guess). = 1 cent
Looks like the patching on the road is about the same size as the pass through If that were the case probably needed a different sub-base build up over the concrete in that area. As compaction is always tough around these things gravels sift down around the edges and create voids.... etc. etc. = 1 cents
Maybe..... :-/
my two cents;
considering the direction of helical corrugations of the pipe arch, on the left side of the arch, some water falling down the concrete face makes its way into the culvert opening, but BETWEEN the pipe arch and the concrete. on the right side, the helical corrugations would shed the water out of the culvert face. freeze thaw cycles later create the void between the concrete and pipe arch.
it is also possible that the water is penetrating from the pavement cracks, through the subbase, through the soil backfill, and then creating the freeze thaw void deeper in the culvert.
i wouldnt expect the concrete to grip a pipe arch culvert that well anyway. it is a relatively smooth surface. the only bits for the concrete to try to grip are the small nuts and bolts that clip the panels together. i don't see any 'nelson studs' on the arch. they would have helped
having said all this, the deformations on the top left will continue, with almost nothing on the top right.
why the monitoring program? looks imprecise
You have answered ...
one of the questions of the ages. Now I know how to spell that noise. I have added it to my spell check.
Thank you! 🙂
You have answered ...>Dave
You obviouisly didn't see enough of the Road Runner cartoons! I beleive that every episode had it spelled out..
You have answered ...>Dave
There's gotta be a frac job within 200 miles that we can blame it on.
Pablo B-)
Good concrete has a high compression strength so I don't think the top cover, being concrete, is the cause of the failure. With Moe Shetty and believe it is water and freeze related. If it were me, I would pump some light grout into the cavity and then put some sort of a gutter system or eaves around that steel liner after making sure that water was not infiltrating from the road surface and stopping all leaks.
jud
I think Norman is on the right track. I would also suspect the lack of proper compaction below the spring-line of the pipe.
If I may ask, why was such a large culvert used for the small channel shown in the picture? I understand that spring runoff could overflow the stream, but there doesn't seem to be much evidence of past flooding. Animal passage and connectivity would be a logical answer?