upcountry99
Student
- Nov 2, 2024
- 9
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 slope failure ? basically ~500 pounds/sf and 75sf per tank. Thinking a soldier pile wall to retain the cut above/behind the tanks. The plumbing contractor says go for it; the structural engineer isn't sure. A topo sketch is attached (2' contours) and the soil parameters are
Backfill Soil: Phi = 32 degrees Unit Weight = 125 pcf
Retained Soil: Phi = 32 degrees Unit Weight = 125 pcf
Foundation Soil: Phi = 36 degrees Unit Weight = 120 pcf
Part 2 is, if the above is stable on a 4' cut pad on the native slope, would there be any issue with adding a 3'h wood landscape wall 3-4' below the toe of the tanks to hold the excavated fill material ? Any insights appreciated. This is supposed to be a 'simple' project to get an affordable home site up and going quickly and we can't seem to get agreement from the engineers involved.
Is there any issue with the loading of the filled tanks causing slope failure ? basically ~500 pounds/sf and 75sf per tank. Thinking a soldier pile wall to retain the cut above/behind the tanks. The plumbing contractor says go for it; the structural engineer isn't sure. A topo sketch is attached (2' contours) and the soil parameters are
Backfill Soil: Phi = 32 degrees Unit Weight = 125 pcf
Retained Soil: Phi = 32 degrees Unit Weight = 125 pcf
Foundation Soil: Phi = 36 degrees Unit Weight = 120 pcf
Part 2 is, if the above is stable on a 4' cut pad on the native slope, would there be any issue with adding a 3'h wood landscape wall 3-4' below the toe of the tanks to hold the excavated fill material ? Any insights appreciated. This is supposed to be a 'simple' project to get an affordable home site up and going quickly and we can't seem to get agreement from the engineers involved.