properties of engineered fill
properties of engineered fill
(OP)
Hi,
may be a dump question since I am structural engineer not pavement or geotech, but I have to check the bearing capacity and settlement of the structures on the compacted engineered fill. My question is what is the difference between the well graded gravel bearing capacity, i.e. 80mm minus pit-run gravel, 40mm minus gravel, 20mm minus gravel etc. Where I can get the properties (bearing and elastic modulus ) for this type of compacted granualar fill.
may be a dump question since I am structural engineer not pavement or geotech, but I have to check the bearing capacity and settlement of the structures on the compacted engineered fill. My question is what is the difference between the well graded gravel bearing capacity, i.e. 80mm minus pit-run gravel, 40mm minus gravel, 20mm minus gravel etc. Where I can get the properties (bearing and elastic modulus ) for this type of compacted granualar fill.





RE: properties of engineered fill
RE: properties of engineered fill
RE: properties of engineered fill
That Geotech may find that you have more to worry about with the soil below that compacted granular layer. Give that person all the scoop on loads and desired foundation type.
RE: properties of engineered fill
RE: properties of engineered fill
Bearing capacity is usually determined on the basis of foundation performance. As a geotechnical engineer there may be some soil strength that would support a very heavily-loaded footing before failure. However, there may be too much settlement associated with that soil strength, either in the form of elastic compression or consolidation. As such, the geotechnical engineer usually recommends an allowable bearing pressure based on settlement (typically controlled to 1 in or less).
Now, let's consider a 200 kip column footing designed for 3,000 psf. You may have the bearing grade of the column 2 ft below the floor slab elevation and it would be about 8 ft square. For a footing that's 8 ft square, you must consider the relavance of soils that extend to depths of 12 to 16 ft - not just whether there is some 2 ft thick subbase of this aggregate or that aggregate.
Now let's consider a "typical" soil profile. You're likely to have multiple layers of soil in the 12 to 16 ft that underlie the foundation. Each of these layers may have different bahavior. The role of the geotechnical engineer is to characterize these engineering properties and develop a set of recommendations that limits risk to the structural performance.
That's my job in a nutshell.
Hope this helps.
f-d
¡papá gordo ain't no madre flaca!
RE: properties of engineered fill