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  1. U

    help with storage tanks on a slope

    OK that's more useful. What would a hand calc look like for this situation ? The report did do a monte carlo simulation of shallow slope failure for the opposite side of the knoll (same section line) which is where there would be a habitable structure and the FoS is 1.1 below the 1.5:1 line at...
  2. U

    help with storage tanks on a slope

    Yes that is a good thought and as a ballpark say it's 100 pounds/cu ft for the soil removed ~ a 4'h x 10'w wedge x 20' l. Say that's 40k pounds of soil. The filled tanks would be 10k gallons ~ 80k pounds. So the difference is only a few hundred psf. But again I'm looking for a mathematical...
  3. U

    help with storage tanks on a slope

    OK thanks but so far no one has addressed the simple question: what is the quantitative approach to analyzing the static case ? I'm looking for a mathematical answer not simply advice to get our geotech to address it. It's not about the cost of that work or the insurance it's about getting a...
  4. U

    help with storage tanks on a slope

    I've yet to hear any reason, logic, method or analysis from you ~ just unhelpful trolling. So I certainly won't be hiring you. Hopefully a qualified engineering member here can demonstrate some knowledge. I have a graduate engineering degree myself ~ and years of computer science background ~...
  5. U

    help with storage tanks on a slope

    On the other hand, it may be that simple. I'm looking for a basic quantitative approach based on the soil parameters, the slope and the weight and area of the tanks. Let's assume there are no abnormalities or fissures in the bedrock at that area of the slope. See attached geologic map ~ we are...
  6. U

    help with storage tanks on a slope

    What other data or parameters are needed from the geotech report to analyze other than the soil parameters provided in the question? The sketch (topo plan view) is simple. It's cutting a 10' wide 4' deep (at the upslope side) level bench to set the two poly tanks on. The toe of the tanks would...
  7. U

    help with storage tanks on a slope

    We've got a geotech report, cores, sections etc. for the site. It doesn't specifically address cutting a bench into this slope. The bench would set on resistant bedrock. The only question is the weight of the filled tanks. How would you quantitatively evaluate the effect of the weight on the...
  8. U

    help with storage tanks on a slope

    Thanks Dave for the reply but we are looking for specific, conclusive evaluation. Is there any problem with cutting a 4’ bench to set the tanks on ? The wall is only to retain the upslope cut, not the tanks. We have a geotech report and parameters. The slope is considered stable as-is. So the...
  9. U

    help with storage tanks on a slope

    We need to install two 10' dia x 8'h polypro water storage tanks on a 40% slope. Thinking we can make a 4' cut for a bench and compacted gravel pad. This is bearing on sandstone bedrock below a ridgeline; there is no groundwater. Is there any issue with the loading of the filled tanks causing...

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