Dynamic Formula for Pressure Injected Footings

by Reymond L. Nordlund, (M.ASCE), Vice. Pres. and Chf. Engr.; Franki Foundation Co., Arlington, Va.,

Serial Information: Journal of the Geotechnical Engineering Division, 1982, Vol. 108, Issue 3, Pg. 419-437

Document Type: Journal Paper

Abstract: The mathematical derivation of a dynamic pile-driving formula for the installation of Pressure Injected Footings (Franki Piles) is presented. The usefulness of such a formula, despite the inherent limitations of all dynamic formulas, is demonstrated. The necessity of differentiating between the two fundamental methods used to make the shaft of a Pressure Injected Footing is proposed and load-test data then presented which support the proposition. An example of how to use the formula is given. The formula contains a constant which is a function of the type of soil and type of shaft. If the result of a load-test is available, the constant can be evaluated from the test data. For those cases where no load-test result is available, a table is presented giving suggested values of the constant for various types of soil and shaft.

Subject Headings: Load tests | Dynamic pressure | Footings | Shafts | Soil classification | Mathematics | Pile driving | Piles |

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