Clean fill dump site slippage (NEED HELP!)
Clean fill dump site slippage (NEED HELP!)
(OP)
I have a commercial construction business and at one of my properties I own a small clean fill dump site that we use to dump clean soil, concrete, rock, etc. The dump site is on a hillside that leads to a river. At the base of the hill, between our dump site, and the river, there's a 21" aerial sewer line owned by our local sanitation department. We recently discovered that the sewer line is broke, because one of the piers it's set on has shifted. I want to know if it's possible that the weight of the fill that I've dumped on the hillside could cause the peering below it to move.
Some additional facts:
The sewer pipe at the bottom of the hill is in a waterway that often floods. The river was over the sewer line about 2 weeks before we noticed the break in the pipe.
The closest fill to the sewer line is approximately 40 feet away. There has not been any rocks/debris fall on to the sewer line.
There is no sign of slippage between the sewer line and the fill site. There are trees between the sewer line and the fill site that are standing straight up.
The area that this sewer line is in is known for slipping. There is some kind of fault line that runs through our fill area.
Some additional facts:
The sewer pipe at the bottom of the hill is in a waterway that often floods. The river was over the sewer line about 2 weeks before we noticed the break in the pipe.
The closest fill to the sewer line is approximately 40 feet away. There has not been any rocks/debris fall on to the sewer line.
There is no sign of slippage between the sewer line and the fill site. There are trees between the sewer line and the fill site that are standing straight up.
The area that this sewer line is in is known for slipping. There is some kind of fault line that runs through our fill area.
RE: Clean fill dump site slippage (NEED HELP!)
Dik
RE: Clean fill dump site slippage (NEED HELP!)
That said, you could go to the trouble of installing a slope inclinometer at the property line and obtaining measurements of ground movement (or lack thereof). If there is nothing to record, that'll tell you something.
If you do; however, record movement, you'd have to come clean and own up to the problem, eh?
f-d
ípapß gordo ainÆt no madre flaca!
RE: Clean fill dump site slippage (NEED HELP!)
RE: Clean fill dump site slippage (NEED HELP!)
Fatdad: Never encountered a slope inclinometer... had to look it up.
OG: Hadn't thought of survey stuff...
part of my learning process... thanks, Dik
RE: Clean fill dump site slippage (NEED HELP!)
Call your insurance and get ready for bad news.
Best of luck.
Mike Lambert
RE: Clean fill dump site slippage (NEED HELP!)
-B
RE: Clean fill dump site slippage (NEED HELP!)
RE: Clean fill dump site slippage (NEED HELP!)
Just thought of it... is some soil has subsided, do NOT backfill the portion that has gone down...
What area are you in?
Dik
RE: Clean fill dump site slippage (NEED HELP!)
RE: Clean fill dump site slippage (NEED HELP!)
RE: Clean fill dump site slippage (NEED HELP!)
If you have managed to induce movement of the pipe at a distance of 40 feet from the toe of your fill embankment, it would require a deep circular slip surface with high volumes of movement.
In most instances, a movement of this scale would require a deep clay soil profile at the toe of your fill. Usually, one would expect to see a very clear bulge in the ground where the deep failure surface "kicks out" below your slope. If there is no evidence of any such feature, there is no clear reason to believe the failed pipe pier is landslip-associated. Check your waterway and see if any rock outcrop is present- if so, I doubt your fill on the slope is the root of the problem.
All of the advice for monitoring movement would be the best way forward, but until you have clear reason to believe your land has slipped, don't look too guilty...but do employ a geotech. in the future!
All the best,
Mike
RE: Clean fill dump site slippage (NEED HELP!)
Should have happened, yesterday... all the information above is pretty sound; if your lawyer allows it, can you advise of any outcome?
Dik
RE: Clean fill dump site slippage (NEED HELP!)
RE: Clean fill dump site slippage (NEED HELP!)