A Primer on Micropiles

by Donald A. Bruce, (M.ASCE), Vice President; Nicholson Construction Co., Bridgeville, PA 15017,
Al F. DiMillio, (M.ASCE), Geotechnical Research Manager; FHWA, McLean, VA 22101,
Ilan Juran, (M.ASCE), Professor and Head of Civ. Engrg. Dept.; Polytechnic University, Brooklyn, NY 11201,

Serial Information: Civil Engineering—ASCE, 1995, Vol. 65, Issue 12, Pg. 51-54

Document Type: Feature article


A major study of micropile technology has recently been funded by the Federal Highway Authority and completed by the authors. The subject is defined as a drilled and grouted, cast-in-place, reinforced pile of nominal diameter less than 300 mm. Micropiles have exceptional qualities not least of which are their relatively high axial load holding performance and their ability to be installed in very difficult locations and geologies. The bulk of the FHWA study relates to design, construction and performance. However, this article provides an overview of the technology with respect to characteristics, definitions, historical development and applications, in order to establish common background for other publications on the subject.

Subject Headings: Micro piles | Axial loads | Federal government | Highways and roads | Drilling | Grouting | Cast in place | Piles

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