Driveway sinking

   / Driveway sinking
  • Thread Starter
#51  
My question is does this look like just a low spot where water settles? Or is it more of a spot where water crosses headed somewhere else? I am wondering if a chunk of culvert might be a better long term fix...

The portion of my driveway that I am now talking about (which is the majority of it) has had 2 spreads of gravel put on it over the past 7 years. It has done pretty well. This winter we have gotten a LOT of water and many freeze/thaws and the gravel in this part has kind of disappeared into the mud beneath. Everything here is really saturated at the moment and just walking across grassy areas water just squishes out of the ground. I do not think much, if any, of the gravel in these areas would be worth trying to get up before putting the paper down. I may try in some areas though. Last thing I want to do is put muddy gravel back on top.

Nick
 
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   / Driveway sinking #52  
Last think I want to do is put muddy gravel back on top.
Nick

If it's mostly gravel though... it'll dry out. compact and put a little new stone on top. I re-aligned a 200' portion of my driveway for aesthetic reasons after we finished building my house, so I rented a mini-ex to "harvest" all the gravel off the old drive. Of course it mixed in with a bunch of dirt but that was pretty hard to control. It still made excellent base material for the new driveway portion - but, I suppose I am blessed with naturally sandy soils. We then put a thin layer of 1-3" limestone on top which has held up real nicely so far, and I plan to get it top-coated with a final 3/4" minus layer once the spring thaw is over. If I had clay soils, I would definitely have used the fabric. Eddie might be right that it is often unnecessary, but it's pretty cheap insurance in the long run, to know you'll never lose your stone down into the mud below.

Of course, all that said, the main key is to NEVER LET WATER RUN ONTO YOUR ROAD. Big ditches and big crown. :)
 
   / Driveway sinking #53  
At one time road builders used logs to float a road base across bottomless swamps. Today they use fabric.
A friend had a drive built across a bog to a so called island where the cabin is....they used fabric right on top of the bog then laid down big crush on top then gravel as a top coat....the whole drive just floats on the bog and will support any loaded dump truck plus.

If your current gravel is contaminated with the clay then just grade it out when dry lay the fabric and put down pit run then top with a good crush and will be good
 
   / Driveway sinking #54  
In clay or hardpan ground fabric works, otherwise when the ground gets fully saturated with moisture the subsoil will migrate thru any gravel put down.
My driveway was put in, in the early 70's and has had an unholy amount of gravel and drainage work done to it but the hardpan still works its way up through.
I know of field roadways that had tons of stone placed in them over the years, you could not drive a fence post into them when it dries but when the frost starts coming out and the
ground is saturated you can get stuck in them. So put your fabric down it the bad places top coat it and go on.
 
   / Driveway sinking #55  
My roadway to my backfield is good year round, even the spring when any hole more than 6" deep will have standing water. The clay in the area is a couple of feet thick under it all. Ditches work for me, to catch all of the surface water, field drain water (rain, melt). The ditches are sloped and have culverts and carry the water away. Before I put the ditches in and put down 3-4" of gravel everything was a sloppy mudfest. The horses would sink to above their fetlocks.
It all comes back to drainage.
 
   / Driveway sinking #56  
I'm for fixing the spot you referred to the right way the first time, cost somewhat set aside. If you do it right, you won't be screwing with every year for years to come. Once and done!
For me that would be, digging out the clay as far as needed to get to a hard base which can allow for proper drainage. Then use or don't the fabric - since you already have why not use it, then build up the drive in the area where you dug with the proper stone and so on until you have a fully compacted area with crown, AND any needed ditching or culverts, or both.

Clay is crap for drainage and will mess with your mind if not addressed. I've lived in our VT property since 1986 and seen it allow a driveway that was installed by the former builder/owner literally bounce up and down when walked on in front of the garage bays and other sections during thaws and in Spring.

Like you I have higher land above the garage area turnaround and the hydraulic pressure over the years from improper drainage has knocked down a hollow block wall along the bank adjacent to the garage two times over the last 20 or so years. With the hollow block it was required to put 2 courses of blocks into a trench then use fabric from the top of each row of blocks tied back into the bank, stone covering and filled and tamped into each row of blocks. Then plastic pins hammered into the top of each block to allow the next course to move slightly and to retain the wall's offset from row to row.. We ran drainage tile with a sock along the entire length to keep fines out from the trench across the drive to daylight. It didn't do a thing, once the water built up behind the wall it just pushed like a glacier against the wall and broke it into a pile of random block in front of the bay doors. It might have taken 8-10 years to break apart. All due to clay's inability to allow water past it further into the underdrive areas.

The drive is over 400 feet to the top of the turn around in front of the garage bays. Recently I added a couple of strategic sections of 18" plastic double lined culvert, essentially, 40' total, and it has worked wonders. I worked with the excavator to determine where to install them and one is where the drive starts to turn and head straight down to the town road. I have a ditch lined with 6"+ jagged stone to catch the water run off from the drive and from the high land adjacent to the drive. Last summer I had the excavator back to swail the ditch shape to allow the drive to take priority over the high land when torrential rains come and have twice completely ripped out some of my higher elevation ditches. This time the damage was extreme in a July 1st storm that blew out a State highway 5' culvert at the end of our road and the State road. It forced the State to close the highway, rebuild the roadway and the ditches. The repair work at my ditches behind the house and barn took 10 days, 8 hrs/day and over $20,000 in machine and stone work. Yikes!:confused3:
Fortunately the culverts installed along the front drive held off everything and very little damage occurred to the main drive, for once. It had along with the entire drive(s) surfaces been recoated with local stone then rolled/compacted earlier in the Spring.

We installed a few strategic catch basins, filled with large stones/small boulders to stop the flow of water so it is less likely to blow all the stone out of the ditches behind the house/barn/shed areas on it's way to level ground. Hoping it will hold the next monster storm....

If it were my place I wouldn't even consider concrete or asphalt until your drainage problems are solved, not just patched up. Neither will reduce water flow- it will direct surface water and rain/snow runoff to where it will flow following what grade you finish it with.
I'm NOT saying never to concrete or asphalt; I am saying just not now. Once it's fixed and has a couple of years of 4 full seasons, maybe then, if still wanting to do it...
There must be people in your local are who you could consult with for a fee to see if what you plan to do is likely the job solution and follows known best practice parameters for you part of your State.
 
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   / Driveway sinking #58  
Dig out the clay to a solid base?? What's a solid base?

Unless you reach ledge- below the clay in my area is hardpan - and that is compacted clay and stone. I imagine that moves with the wet/moisture and freeze cycles as well!
 
   / Driveway sinking #59  
Unless you reach ledge- below the clay in my area is hardpan - and that is compacted clay and stone. I imagine that moves with the wet/moisture and freeze cycles as well!

I know that feeling, when I had a well drilled the driller and I talked about what to do if he bed rock under 20ft, turned out to not be an issue, 97 ft of hard pan and boulders.
 
   / Driveway sinking #60  
Many roads are made of well compacted clay covered with asphalt to keep water off.
 

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