Demonstrating the Ability to Develop Cylindrical and Spherical Cavity Expansions on Drilled Shafts in Cohesionless Soils...


Material Information

Demonstrating the Ability to Develop Cylindrical and Spherical Cavity Expansions on Drilled Shafts in Cohesionless Soils through Full Scale Experimentation
Physical Description:
1 online resource (170 p.)
Schwartz, John Leslie, III
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Master's ( M.E.)
Degree Grantor:
University of Florida
Degree Disciplines:
Civil Engineering, Civil and Coastal Engineering
Committee Chair:
Mcvay, Michael C
Committee Members:
Hiltunen, Dennis R


Subjects / Keywords:
capacity -- cavity -- drilled -- foundation -- geothech -- grout -- pressure -- shaft
Civil and Coastal Engineering -- Dissertations, Academic -- UF
Civil Engineering thesis, M.E.
Electronic Thesis or Dissertation
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )


Post grouting drilled shaft tips is common practice in many countries across the world and has begun to be considered in the United States over the past decade.  By improving the soil behavior around and below the shaft by means of conventional post grouting processes, a greater amount of tip resistance can be mobilized over smaller displacements.  However, the current method of post grouting drilled shafts does not necessarily improve the capacity of the shafts.  Therefore, a new method of post grouting drilled shaft is being investigated, and more specifically, developing cavity expansions through post grouting the bottom side of drilled shafts prior to tip grouting (McVay et al. 2009).  By developing cylindrical and spherical cavity expansions during the side and tip grouting processes, the soil configuration and stress state around and below the shaft is changed such that a greater shear resistance can be mobilized (i.e., greater axial resistance).  In addition, through development of cylindrical and spherical cavity expansions, the expected/predicted grout flow can be more accurately assessed and thus less uncertainty when estimating the grout flow during post grouting processes.  Assisted by the Florida Department of Transportation and University of Florida, a viable method of construction for the new post grouting process was designed and full scale testing was performed to validate construction methods and identify potential design parameters for post grouting the bottom side and tip of drilled shafts in cohesionless soils.  In conjunction, laboratory and other performance based tests were performed on the construction materials to insure quality and reliability.  Theoretical values, such as the expected grout pressure and volume, changes in the soil stress state, and the mobilized side and tip resistance of the shaft during post grouting processes and axial loading (top-down test), were compared with the collected data (observed displacements, changes in soil stress, and strain within the shaft).  Visual examination of post grouted shaft and grout bulb shapes helped determine if cylindrical and spherical cavity expansions occurred.  Results presented in this paper will emphasize on the design parameters, design evolution of the various grouting systems, applicable findings, and the overall performance of the new post grouting process.
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Thesis (M.E.)--University of Florida, 2012.
Adviser: Mcvay, Michael C.
Electronic Access:
Statement of Responsibility:
by John Leslie Schwartz III.

Record Information

Source Institution:
Rights Management:
Applicable rights reserved.
lcc - LD1780 2012
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