In drilled pier design for compression loading, and in fairly uniform alluvial soils, I typically follow the FHWA recommendations for limiting the length:diameter ratio to be less than 30, adopting the rationale that load transfer below this depth attenuates.
Beyond the 1999 FHWA Drilled...
I have a question about a topic some of you may be tired of – subgrade modulus – but it does have some interesting features, and I hope someone may have some insight. We are providing recommendations to a structural engineer for modulus of subgrade reaction values beneath a 2.5-ft thick mat...
I'm reviewing a design for an addition to an existing structure. The original structure is supported on belled piers, about 12 feet deep and 10 feet in diameter, bearing on med dense to dense alluvium. The column loads of the addition are such that deep foundations are required, and 36-inch...
