UFC 3-220-01N
15 AUGUST 2005
CHAPTER 4
SHALLOW FOUNDATIONS
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INTRODUCTION
4-1.1
Purpose. This chapter presents guidance for selecting and designing
shallow foundations for buildings and structures. Shallow foundations are those that
bear at a Depth of bearing/Base (D/B) width of footing equal to less than 5. The
referenced criteria are to be used by the engineer to develop the bearing capacity,
settlement potential and size of shallow foundations for buildings or structures.
4-1.2
Scope. Apply criteria to all projects for the military services. The methods
for determining the ability to use a shallow foundation, settlement potential (the most
important factor in shallow foundation design) allowable soil bearing capacity as limited
by shear strength, and the size of the foundation are presented in referenced criteria.
The allowable settlement tolerances for structures are covered in the primary
references.
4-1.3
Soil Stabilitization For Structures," Chapter 10, "Foundations in Expansive Soils," and
Chapter 11 "Foundations in Areas of Significant Frost Penetration" and Chapter 12
"Foundations for Vibrating Equipment and Seismic Loadings" when designing shallow
foundations when any of the factors, excavations, soil stabilization, expansive soils,
seismic situations, vibration or significant frost penetration are present for a particular
site.
4-1.4
References. These present load factor and safety factor design methods
and should be used as a unit. Last reference presents safety factor design and the
classic design procedures.
Engineering Manual for Shallow Foundations, Driven Piles, Drilled
Shafts, Retaining Walls and Abutments
Engineering Manual for Settlement Studies
Shear Strength Correlation for Geotechnical Engineering
UFC 3-220-10N, Soil Mechanics
4-1.5
Secondary References
American Society of Civil Engineers, Settlement Analysis, Technical
Engineering and Design Guides
American Society of Civil Engineers, Design of Shallow Foundations
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