I had a watermain problem that has been repair. The plumber had to dig
part of my asphalt driveway, to reveal that a crumby coupling joint had
gone bad. I now have copper all the way to the street valve and it has
been run through the old plastic. Now to the matter at hand...when he
dug up where the union was, he found quite a big sinkhole under the
asphalt, were the water had washed the soil away as silt (I presume).
Both, him and I tried to back fill the sink hole as best as possible,
with a hydrolic tamper, but obviously we couldn't completely fill it to
the point of complete "packness". So now as the freshly backfilled
dirt has settled a bit, the driveway has sunk a bit and there are some
small stress fractures around the sunken part of the asphalt. My
question is: can I just throw some patch in the dug up hole (this is
just rock dust now) and the surrounding area of asphalt that has sunk
around the hole or do I have to cut up all the sunken asphalt as well
and redo the entire hole? I had planned on waiting a few months for
the ground to completely settle and all the ground water from the leak
to disperse. Then thoroughly clean the sunken asphalt and dig up the
stone dust to a depth of about 4" then backfill with cold patch. Does
that sound sufficient?
Sorry for being long winded and thanks in advance for the advice...
I had a house with a gravel driveway that would develop large potholes every
couple of years. I kept filling them with gravel until a contractor
suggested blast rock. These are chunks of rock, irregularly shaped under an
inch in size. What happened when using this rock was the pieces locked
together rather than being forced into the dirt and sand. I know this only
answers part of your question, but it might help someone else with potholes
or sink holes.....Ross
If you want it done right so that it will last, I'd suggest getting a
contractor to hot patch it. It should be excavated back to a perimeter
where the ground is solid, base material placed in the hole area,
compacted, then FABC. You can do this yourself for a small hole with
cold patch, but for a reasonable size one, without the right eqpt, etc,
it's not worth it.
There is a backfilling procedure called "puddling" that works very well in
granular soils -- gravel, sand and silts. You partially fill the hole with
water so that the backfilled soil is deposited under the pool. A puddling
stick (piece of 2x4, etc.) can be used if needed to break up clods. As the
water drains out of the replaced fill, the soil compacts to near its maximum
density. This does not work well on soils that are very clayey since the
clay gels up and takes forever to drain out.
If a hole has already been loosely backfilled, jetting to flood the soil
and drive out the air can settle what is there. Then, in a day or so when
the water is drained out and the soil settled, you can add the needed soil.
For my little yard projects, I do this with a watering lance which has had
the water orifices drilled out to pass more water. -- SJF
I should add that the water jet is probed around the backfill to wet all
parts, rather than making one insertion and letting it run. In
predominantly granular soils, you may observe the settlement while you are
probing. -- SJF
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