There have been many Eng-Tips discussions on strip surcharge lateral pressures, you can find in a search.
The one EireChch mentions is a good one:
https://www.eng-tips.com/threads/lateral-earth-pressure-from-surcharges-and-the-2x-factor.330567
It seems apparent the Das formula is in error, all...
The contact area is not a factor in sliding resistance, the resistance=weight x coefficient of friction.
As you recognized, all the weight is transferred to the walls, the void has no 'bearing' on the analysis.
There may be a small portion of the slab weight supported on the soil, but as...
Are 2 layers of reinforcing necessary? Aircraft pavement is typically thicker, and unreinforced (or at least used to be). The steel was not necessary for support/structural reasons. Use of appropriate contraction joints addressed crack control.
You could show it either way, as long as it's well identified which is which. I'd think the road below is more pertinent to the utility installation, so would show the bridge above with less dominant linework, either hidden/dashed, or faded.
If you think the groundwater can be controlled sufficiently to perform earthwork to that depth, why not instead just place the pier below the frost level and forego the subgrade replacement with gravel?
The gravel replacement idea should provide adequate foundation support, as the chance of...
You mentioned 'tolerances', what are they, what is required by the specifications? For a finished surface of earth (vs pavement), a typical tolerance (allowed deviation from design grade) is something on the order of +/- 0.05 feet, or about 1/2 inch. The tolerance would be independent of slope...
That soil type (silty sand), very low blow counts, below the water table, present very high chance of liquefication during a seismic event, leading to settlement, sand boils, etc.
Unless site is in a very low seismic region.
Not all system variables can be set through user accessed settings, but this one can be apparently (I read online, didn’t verify):
Tools/Options/User Preferences/Prioroty for Coordinate Data Entry ... select "Keyboard Entry" vs "Running Object Snap".
Set OSNAPCOORD to 1 or 2 to prevent osnaps from controlling during coordinate entries
https://help.autodesk.com/view/ACD/2025/ENU/?guid=GUID-94994960-5E62-4044-BEF7-9CF91667F641
I would think the PC design/sizing is more a function of the maximum expected inflow rate, rather than daily flow rate. The PC size is as necessary to limit number of pump starts per hour. So maybe you should be asking the ME, and possibly the bakery, what is the maximum expected flowrate &...
Regarding #2:
I'm guessing by "shear", this is lateral load from the structure that will transfer to the foundation. But depending on how the load is transferred, some may be resisted by grade beams (setting on the earth) and grade slabs. It some cases it may be reasonable to assume that those...
Your scheme leaves some cold bridges from the inside cold temperatures, to the footing. The below additional insulation could address that. Though the slab itself could experience frost effects.
