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Working around retaining wall obstruction
KW are you using geogrid between the lifts of backfill?
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Working around retaining wall obstruction
KW have you heard of the enemy to construction projects? His name is Gravity.
If I understand your description of the job, you might want to consider using the geogrid to keep the walls from bulging over time. And compacted sand is fine providing there is resistance i.e. walls to keep it in place. As soon as the reatineing system moves it's no longer compacted. And it depends on the type of sand you're using too--some sand does not ever compact; others can compact beyond belief. We call the latter around here "sharp sand" which has jagged sharp edges that interlock. For road building and backfilling basement digs, we use a Class 2 sand.
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Working around retaining wall obstruction
Here's a case in point: A local developer--who should have known better-- built a big home in the middle of wet lands on a mound of dirt that was just big enough to place the home. The driveway was about 20 feet wide and 150 long and made a lazy curve toward the home on each side. Both sides were formed of 90 lb. retaining blocks 4 feet high. The 20' x 4' x 150' drive was filled with crushed stone. No geogrid was used. Then an 80,000lb. concrete truck drove about 5-6 feet from the edge and took out about 75 feet of wall on one side.
The builder had me dig out half the width of the driveway down 4 feet and rebuild the wall this time with geogrid every other course.
After it was all done, later another cement truck was able to drive right next to the block wall and didn't even move the blocks, according to the builder who was ecstatic it worked.
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Working around retaining wall obstruction
The mesh comes in various thicknesses; fabric widths; diameter of the "threads" in the mesh; what the threads are made of; what the mesh is coated with; and the open spaces between the threads themselves--to name some characteristics. This shouldn't be confused with "GeoTextiles" which are a mesh, but are usually tightly woven and used priimarily for road building. The theory behind the GeoTextile is similar to how a trampoline works, except there's road building material covering it.
(I'm kinda needing more rest--so my description needs some polish--but here goes
The GeoGrid I've used has openings of about an inch and the fabric roll is about 4-5' wide. It looks like wire fencing but coated black. Essentially you are building a dirt-and-GeoGrid sandwich many layers tall. The GeoGrid lays between the stacked courses of retaining wall and is usually held in place by the weight of the blocks and interlocking vertical pins.
If you have ever tried to pull a section of downed cyclone fence that has weeds growing up through it, you'll have a basic understanding how the GeoGrid works. But multiply that pulling force many times with each successive layer of fabric.
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