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Crushed stone size limitation for non-expansive frostfree fill If you are referring to non-frost susceptible (NFS) material, the definition is a soil that contains no more than 3% by weight finer than 0 02 mm A #200 sieve is generally used (0 074 mm), for which the requirement is no more than 5% passing Whether crushed or not isn't a factor
quot;Top quot; or quot;Bottom quot; of Footing? - Eng-Tips I agree that "bottom of footing" is the standard in regards to frost depth A note on JAE's comment-I don't agree the 42" footing depth versus an "average" frost depth of 26" is the correct picture of the safety factor The frost depth value to consider is the design depth of frost, which is typically the 30-year maximum value
Exterior Large Equipment Pad with deep frost depths - Eng-Tips So, the frost depth say 6 ft specified at local code may occur at outside of insulated SOG, but the frost depth below SOG will be around just one ft I want to add that, if the soil is collapsible ( silty clay with some organics) the ground may settle every year at the end of frost season My suggestion to BSPE90 will be;
Frost Heave Calculation | Eng-Tips I view frost as an "infinite" force If conditions are right for it to form, it can lift just about anything I don't know of any calculation that will give frost pressure I've seen published values of 10 tsf, but I believe they are based on back-calculating the pressure required to lift a building where frost heave was observed
Frost protection of fill | Eng-Tips For example snow covered ground will have musch less frost penetration than an area kept clear of snow The depth the frost will penetrate below the insulating layer depends on insulating value (thermal conductivity and thickness), initial ground temperature, and of course the air temperature over the freezing period
Which soils are most susceptible to frost heaving? - Eng-Tips As shown in cvg's second link, a clay is not as frost-suceptible as a silt This is because moisture does not migrate through this soil quickly enough to build up significant ice lenses in the soil as the freezing front advances However there is still some potential for frost heave, especially of there are variations in the soil
Is Frost Depth Always Required? | Eng-Tips No, frost depth is not always required if what you are supporting can withstand the movement However, for most pipe racks we have designed we have gone to frost depth There have been a few short runs where the client did not want to go that deep We informed the client of the potential heave and the possible issues (similar to you describing)
Frost susceptibility of pile supported foundations - Eng-Tips I assume your pile are placed so the tips are below the frost line here Logically thinking here, discounting the weight of the pile and any dead load the pile may support, if frost heave were to occur on a pile, it would have to develop enough friction on the side of the pile to lift the pile, over-riding any side friction below the frost line
Stoops | Eng-Tips In freeze areas, provide a deep enough foundation underneath to avoid frost heave and the resulting jamming of the door as it tries to open Upvote 0 Downvote Mar 7, 2008
outdoor equipment pad | Eng-Tips To prevent heaving beneath utility pads on grade we usually either hire a geotechnical engineer to check the soil to see if it is frost susceptible, or excavate and replace with a granular, non-frost susceptible material of sufficient particle size (gravel, crushed stone)to a depth equal to the depth of frost dictated by local authorities