Banca de DEFESA: FELIPY LIMA DE QUEIROZ

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : FELIPY LIMA DE QUEIROZ
DATA : 31/07/2018
HORA: 14:00
LOCAL: A DEFINIR
TÍTULO:
Evaluation of installation and performance of an instrumented helical pile in a sandy soil deposit

PALAVRAS-CHAVES:

Helical pile, instrumentation, pullout load test, DCP, GPR.

 


PÁGINAS: 78
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Geotécnica
RESUMO:

Helical piles are foundation types used to support compressive, tensile, or lateral loading. The capability of being loaded right after installation, the high production rate and the possibility of reutilization in different projects are a few advantages of helical piles. Despite the increasing use of helical pipes, the amount of data collected from field experiments with instrumented helical piles is still relatively small. In this work, the tensile behavior of an instrumented helical pile embedded in a sandy soil deposit is evaluated along the effect of disturbance caused in the ground after installation. The three-plate pile used in this investigation was instrumented with electric resistance strain gages attached to five distinct sections along its shaft. Two sections were used for measuring torque and the other three sections were used for measuring axial load. The performance of the instrumented pile was monitored during installation by measurements of the installation torque. The axial load in the instrumented sections was monitored during two static pullout tests. The disturbance caused by pile installation was evaluated with the results of tests with a dynamic cone penetrometer (DCP) and by radargram renderings from a ground penetration radar (GPR). Measurements of the installation torque along with the pullout test responses resulted in torque factors lower than the typical values found in the literature. Results of the instrumented sections showed that the contribution from the top helical plate in the overall bearing capacity is smaller than that from the truncated cone between the bottom and top plates. The results from the DCP and GPR apparatuses suggest that the passage of the helical plates during pile installation reduced soil compaction within a zone of influence from the shaft of approximately three times the diameter of the largest plate.

 


MEMBROS DA BANCA:
Externo à Instituição - JONH ELOI BEZERRA - UFERSA
Interno - 1515200 - JOSE NERES DA SILVA FILHO
Presidente - 2551234 - YURI DANIEL JATOBA COSTA
Notícia cadastrada em: 11/07/2018 11:28
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