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Pile Friction Freeze: A Field and Laboratory Study. Volume 1 of 2.

PB99140139

Publication Date	1999
Personal Author	McVay, M. C.; Schmertmann, J.; Townsend, F.; Bullock, P.
Page Count	656
Abstract	The objectives of this reseach were to measure the increase in pile friction with time for various soil conditions in the laboratory and field. Accordingly, five fully instrumented piles were driven into a variety of soils at four different FDOT bridge sites. The five eighteen-inch square piles were instrumented with strain gauges, lateral total stress cells, and pore pressure sensors along their length, and at their tips were cast Osterberg load cells. This study was the first application of an Osterberg load cell on a prestressed concrete pile to generate ultimate skin friction. In the laboratory, a device was developed to drive a model pile in the centrifuge in flight at 50 gs and then perform a static pull out (tension) test. Also, in the field SPT Torque, piezo CPT, and DMT stage testing was performed to estimate the pile freeze with time.
Keywords	Pile foundations Piles Skin friction Pore pressure Tables(Data) Aging tests(Materials) Centrifuging Field tests Cohesive soils Load cells Freezing Osterberg load cells
Source Agency	Federal Highway Administration
Corporate Authors	Florida Univ., Gainesville. Dept. of Civil Engineering.; Federal Highway Administration, Tallahassee, FL. Florida Div.; Florida State Dept. of Transportation, Tallahassee. Research Center.
Supplemental Notes	Also pub. as Florida Univ., Gainesville. Dept. of Civil Engineering rept. no. REPT-4910450443312-V1. See also Volume 2, PB99-140147. Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Center. and Federal Highway Administration, Tallahassee, FL. Florida Div.
Document Type	Technical Report
Title Note	Final rept. Feb 93-Apr 99.
NTIS Issue Number	199914
Contract Number	FDOT-B-7967

Pile Friction Freeze: A Field and Laboratory Study. Volume 1 of 2.

Pile Friction Freeze: A Field and Laboratory Study. Volume 1 of 2.
PB99140139

Publication Date	1999
Personal Author	McVay, M. C.; Schmertmann, J.; Townsend, F.; Bullock, P.
Page Count	656
Abstract	The objectives of this reseach were to measure the increase in pile friction with time for various soil conditions in the laboratory and field. Accordingly, five fully instrumented piles were driven into a variety of soils at four different FDOT bridge sites. The five eighteen-inch square piles were instrumented with strain gauges, lateral total stress cells, and pore pressure sensors along their length, and at their tips were cast Osterberg load cells. This study was the first application of an Osterberg load cell on a prestressed concrete pile to generate ultimate skin friction. In the laboratory, a device was developed to drive a model pile in the centrifuge in flight at 50 gs and then perform a static pull out (tension) test. Also, in the field SPT Torque, piezo CPT, and DMT stage testing was performed to estimate the pile freeze with time.
Keywords	Pile foundations Piles Skin friction Pore pressure Tables(Data) Aging tests(Materials) Centrifuging Field tests Cohesive soils Load cells Freezing Osterberg load cells
Source Agency	Federal Highway Administration
Corporate Authors	Florida Univ., Gainesville. Dept. of Civil Engineering.; Federal Highway Administration, Tallahassee, FL. Florida Div.; Florida State Dept. of Transportation, Tallahassee. Research Center.
Supplemental Notes	Also pub. as Florida Univ., Gainesville. Dept. of Civil Engineering rept. no. REPT-4910450443312-V1. See also Volume 2, PB99-140147. Sponsored by Florida State Dept. of Transportation, Tallahassee. Research Center. and Federal Highway Administration, Tallahassee, FL. Florida Div.
Document Type	Technical Report
Title Note	Final rept. Feb 93-Apr 99.
NTIS Issue Number	199914
Contract Number	FDOT-B-7967