Ruiz, Miguel E.

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    Study of axially loaded post grouted drilled shafts using CPT based load transfer curves
    (2005) Ruiz, Miguel E.; Pando-López, Miguel A.; College of Engineering; Fernández, Américo L.; Virella, Juan Carlos; Department of Civil Engineering; Portela, Genock
    Post-grouted drilled shafts (PGDS) have been reported to have increased axial capacity and to experiment smaller settlements, for a certain load level, compared to conventional piles installed under similar conditions. The main objectives of this study are to develop a load transfer methodology for estimating load-settlement behavior of axially loaded piles, and investigate by using the developed methodology the factors responsible for the observed improved performance of PGDS foundations with respect to conventional drilled shafts. The first objective was met through the development of a new load transfer methodology which resulted in the program TZASP, which was validated against five well documented field case studies involving load tests on instrumented drilled shafts. The proposed methodology was used to analyze several case histories involving field load tests of instrumented PGDS foundations. The analytical work revealed the following factors responsible for the improved performance of PGDS foundations: soil compaction and stiffening under the pile tip, shear stress reversal along the pile shaft, and enlarged pile tip area due to the formation of a grout bulb. The results of the PGDS numerical models were used to develop a new PGDS design procedure.