The soil hasn't ever exhibited cracking, even in the driest months. It is also covered in grass. This is a good point though, thanks cvg.
Oldestguy's point about the soil not being saturated is a very good one. The soil is never saturated. We have one of the lowest 100-year storm rainfall...
Apologies for the lack of details.
Blocks: 2ft x 2ft x 6ft 3,600 lbs /block
The soil is silty sand. The angle of repose is 34 degree. The slope above the wall is 30 degrees. Slope rises to a height of 8 feet above the top of the wall.
Wall uses one below grade block. Has two above grade...
I have a situation with an existing ecology block wall. The blocks are 2ft x 2ft x 6ft. The math checks out for holding up the slope provided there is no hydrostatic pressure ( Used Rankine Formula ). However, worse case scenario, the wall fails if water builds up the full height of the wall...
Okay, so my analogy breaks because the PVC as described, can't transfer pressure like soil can.
So if I had a 4 foot high retaining wall with a active soil pressure (Pa) of 830lbs per linear foot, and I also had a hydrostatic head 4ft high behind the wall this would give me an additional 500...
Thanks for the reply.
The marbles analogy helps. I suppose I was thinking about liquefaction, which would only occur during an earthquake or similar event.
So, this goes back to water pressure; something I'm ashamed to admit I struggle to understand.
I keep imagining an L shaped PVC pipe...
I understand that Hydrostatic pressure and Soil pressure exist cocurrently. I am curous if there are any additional variables at work when calcuating total pressure on a retaining wall.
Full disclaimer: I am not an engineer nor do I pretend to be one. I recognize that these are very basic...
Thanks again for the reply. I understand about the surface area. I thought in the event of tight clay you would simply not rely on soil infiltration, and instead you would need to store the entire quantity of water in a large maintainable tank/ dry well until it very slowly infiltrates the...
Thanks for the reply that makes sense. So, I have a follow-up question. Why is rock placed around perforated dry wells? This rock will inevitably get silted up just like any other unmaintainable part of the system. It's extremely labor intensive to move, why not just have the dry well drain...
I'm working on job right now that has a dry well comprised of 70-siv non-woven geotextile fabric filled with drain rock. A perforated PVC pipe sits in the middle of this gravel and disperses the water from several catch basins on the property. The perimeter french drain for a basement also...
You indicate that you already have the percolation rate figured out. How did you do this? Was it field tested? If tested, was it done at a depth of 9 feet?
Yes we tested at 9 feet and at the set grade above. The basement is still partly excavated and hasn't been back filled. It is the same...
I'm working on a small house on a confined lot. We have some drains in a walkout along the side the house and I would like to determine the viability of draining them to a dry-well that is 9 feet below the ground at the back of the property (the basement is 9 feet deep and the dry-well needs...
Rural Eastern WA. We have a lot of 1000-5000 square foot homes being built right now as people from Seattle move over here for the cheep land and to live in the country.
These are residential construction projects not commercial or civil. Specifically it's used for foundations, and retaining...
I'm confused why many Rebar benders on the market, and many I have seen used on construction sites, don't appear to meet the ACI recommendation for min bend diameter.
I was recently on a job that used a Rebar bender similar to this one: https://www.youtube.com/watch?v=IOQBxGYF4zM
The resulting...
