Wrapping your road gravel

[bcp]

Interesting technique for unstable areas. Not just a layer of fabric as is usually seen.

From:
Pacific Highway: Starting over

Think of it as a giant burrito.

Actually, think of it as five giant burritos stacked on top of each other, stretching more than 600 feet and holding a combined 5,200 cubic yards of gravel. Then put a highway on top of them.
...
The "deep patch" method follows a process not used before in Clark County. Crews began by digging out the existing highway and excavating down several feet. After putting down an initial layer of base rock, workers began wrapping subsequent layers of gravel in a flexible "geogrid" fabric designed to withstand some movement without compromising stability. Lead contractor Nutter Corp. of Vancouver will eventually put in five such layers, each about one foot deep, wrapped like a gravel burrito under the highway. Driven posts will help hold the foundation in place.

 

[creekbend]

I had never heard of this technique before until I read your post. Interesting. Thanks for posting.

 

[dave1949]

"That section of Pacific Highway was built on a slope near Jenny Creek that's prone to sinking and shifting. Earlier excavation revealed just how much -- where the roadway had sunk and cracked, crews had previously just laid down more asphalt to level it out. The result? A layer of asphalt that ended up measuring eight feet thick after decades of quick fixes."

Yikes! Interesting story, thanks.