Survey of Micropile Use in Neighboring Western States
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Survey of Micropile Use in Neighboring Western States

Filetype[PDF-854.60 KB]


  • English
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    Details:

    • Creators:
      Perkins, Steve
    • Corporate Creators:
      Montana State University (Bozeman, Mont.). Department of Civil Engineering
    • Corporate Contributors:
    • Subject/TRT Terms:
    • Publication/ Report Number:
      FHWA/MT-15-004/8117-049
    • DOI:
    • Resource Type:
      Tech Report
    • Geographical Coverage:
      United States
    • TRIS Online Accession Number:
      01592040
    • Edition:
      Final Report
    • Corporate Publisher:
      Montana. Dept. of Transportation. Research Programs
    • Abstract:
      Micropiles are small diameter piles that are constructed by drilling and grouting techniques. Micropiles are a foundation alternative that are cost-effective in a variety of conditions encountered in Montana Department of Transportation (MDT) projects, however a limited experience base has led to underutilization of a potentially beneficial foundation alternative. To explore a greater use of micropiles, a survey of nine neighboring western state transportation agencies on the use of engineered micropiles has been developed and conducted with the results compiled and presented in this report. Response to this survey indicated use of micropiles in situations for which they were intended. The use of micropiles was tied to the availability of qualified contractors. With the Pacific Northwest containing such contractors, use in this area has become common practice and satisfaction is high. In states where population density is lower and local micropile contractors are not available, micropiles have been used less frequently. Responses emphasized the importance of a well-qualified contractor and a well-qualified QA/QC program. Responses also indicated the importance of comprehensive geotechnical data describing the subsurface conditions in which micropiles will be installed. For the agencies responding, the greatest use of micropiles was for new bridge foundations, followed by projects involving retrofitting existing bridge foundations. Micropiles appear to be versatile as evidenced by their use on a variety of projects involving structures other than bridge foundations. Responses indicated that micropiles have been used exclusively on projects for which other conventional deep foundation approaches would not work. The reasons for this were approximately split between site surface conditions and subsurface conditions. These responses supported the notion that micropiles are particularly suited for difficult ground conditions (i.e. presence of cobbles and boulders, intermediate geomaterials) and sites with restricted work areas having limited space and/or remote access and/or urban, noise and vibration sensitive sites. Load testing of micropiles is common and appears to be incorporated in all projects. None of the agencies responding indicated a “failure” or lack of capacity with project micropiles that have been load tested, which speaks to the success and high degree of satisfaction of the users. Contracting methods for micropile subcontactors appear to be typical and well established. All agencies have developed specifications and/or special provisions for this technology. Limitations associated with micropiles involve limited lateral capacity in areas of high seismic demand and the higher cost of installation as compared to conventional deep foundations. The latter limitation is not necessarily applicable in common situations where a conventional deep foundation cannot be used.
    • Content Notes:
      For further supporting documents, please visit https://www.mdt.mt.gov/research/projects/mat/micropile.shtml
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      PDF
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