Field testing of jet-grouted piles and drilled shafts.
Advanced Search
Select up to three search categories and corresponding keywords using the fields to the right. Refer to the Help section for more detailed instructions.

Search our Collections & Repository

All these words:

For very narrow results

This exact word or phrase:

When looking for a specific result

Any of these words:

Best used for discovery & interchangable words

None of these words:

Recommended to be used in conjunction with other fields



Publication Date Range:


Document Data


Document Type:






Clear All

Query Builder

Query box

Clear All

For additional assistance using the Custom Query please check out our Help Page


Field testing of jet-grouted piles and drilled shafts.

Filetype[PDF-10.18 MB]

Select the Download button to view the document
This document is over 5mb in size and cannot be previewed
  • English

  • Details:

    • Publication/ Report Number:
    • Resource Type:
    • Geographical Coverage:
    • Abstract:
      A field study of deep foundations supporting high mast lighting and signage was undertaken in typical Florida

      soils. Three drilled shafts (48 in x12 ft and two 48 in x18 ft) and two jet-grouted piles (28 in x18 ft) were

      constructed in Keystone Heights, and subject to axial as well as combined lateral with torsional loading. In the

      case of combined loading, a heavy-duty mast arm equivalent to FDOT’s E7-T6 type was placed on the top of

      each foundation and loaded with a crane. In situ as well as laboratory data were collected for the sand, silt, and

      clay layers to measure properties in order to predict capacities (axial and torsional) based on FDOT () and

      FHWA ( and rational) methods.

      In the case of the axially loaded drilled shafts, FHWA’s rational approach agreed the closest to measured

      results, followed by FHWA’s  method (<20% difference); however, for combined loading (lateral and torque),

      FHWA’s  method was the closest (<12% difference), followed by rational approach (<40% difference). It

      was noted under combined loading that the short shaft underwent lateral and rotational failure, and one of the

      longer shafts had rotation failure in combination with nonlinear lateral response.

      Both of the jet-grouted piles were side grouted, followed by tip grouting to have lateral dimensions similar to

      the drilled shafts. The piles could not be failed axially with top-down testing due to pullout failure of the 40-ft

      reaction shafts. Under combined loading, the jet-grouted piles had 3 times the capacity of the drilled shafts (<30

      of rotation) when loading was stopped (capacity of mast arm). A Statnamic axial capacity of 1000 kip was

      obtained for one of the piles, of which 450 kip was skin friction. Both torsional and axial skin friction of the

      piles were predicted based on pressuremeter testing, as well as observed grout pressures during construction. A

      comparison with similar capacity drilled shafts showed that the jet-grouted piles were 20% to 40% more


    • Format:
    • Funding:
    • Main Document Checksum:
    • File Type:

    Supporting Files

    • No Additional Files

    More +

    You May Also Like

    Checkout today's featured content at

    Version 3.26