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Gustavo Vaz De Mello Guimara¯es - One of the best experts on this subject based on the ideXlab platform.
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
Adrian Mccallum - One of the best experts on this subject based on the ideXlab platform.
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Simple Method for Estimating Snow Strength Using CPT Sleeve Friction Data
Journal of Cold Regions Engineering, 2018Co-Authors: Adrian Mccallum, Aaron WiegandAbstract:AbstractThe in situ strength of polar snow is not easily measured; most assessments rely on indices derived from snow density and/or are limited in depth. To overcome these deficiencies, modified c...
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On the relationship between CPT Sleeve-Friction and snow density
2016Co-Authors: Adrian MccallumAbstract:Snow density profiles are usually determined gravimetrically; only recently have additional tools, such as the neutron probe allowed in situ assessment. However, rapid high-resolution in situ assessment of snow density is still not pos- sible. Data from Cone Penetration Testing (CPT) in polar snow was compared both qualitatively and quantitatively with snow density data in order to examine relationships between CPT Sleeve Friction and density. A statistically significant relationship exists between snow density and depth-adjusted CPT Sleeve-Friction. Use of cone penetration test Sleeve-Friction data enables in situ density estimation to depths of up to 10 m in polar snow; ;
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Direct estimation of snow density from CPT
2014Co-Authors: Adrian MccallumAbstract:A recently devised correlation allows for the direct derivation of soil unit weight from CPT data qt and fs. However, the direct application of this technique to another geomaterial, snow, is not possible; the variable bonding within snow complicates the correlation. To examine the relationship between CPT data and snow unit weight, data from almost one hundred CPTs in Antarctica were analyzed. Snow unit weight is seen to vary with CPT Sleeve Friction and a significant relationship exists between CPT net Sleeve Friction data and snow unit weight. Variations in CPT tip resistance and Sleeve Friction data for polar snow of the same unit weight may provide insight into the microstructure or level of bonding within the snow pack.
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cone penetration testing cpt in antarctic firn an introduction to interpretation
Journal of Glaciology, 2014Co-Authors: Adrian MccallumAbstract:Commercial cone penetration testing (CPT) equipment was adapted to allow penetrative testing in hard polar firn to depths of 10 m. The apparatus is hydraulically driven, rate-controllable and able to penetrate firn with a resistance of 10 MPa. It can be mounted on many types of typical polar vehicles, requiring connection to only hydraulics and 12 V electricity. Data recorded include both cone tip resistance and Sleeve Friction, a parameter not previously examined through such testing. This paper describes the development and calibration of the equipment and examines factors including snow density, penetration rate and cone size and shape that are shown to affect CPT interpretation. CPT can be used efficiently in polar environments to potentially provide estimates of physical parameters in hard firn to substantial depth.
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Cone penetration testing (CPT): A valuable tool for investigating polar snow
Journal of hydrology. New Zealand, 2013Co-Authors: Adrian MccallumAbstract:Penetrative testing is the best means of assessing snow strength in situ. However, in hard polar firn, existing snow penetrative equipment is unable to penetrate at a constant rate to substantial depth. Therefore, existing Cone Penetration Test (CPT) equipment, typically used in soils, was modified to allow efficient testing in snow. Tractor-mounted hydraulically powered CPT equipment enabled rapid testing to depths of 10 m, in polar firn as hard as 10 MPa; data recorded included cone tip resistance and Sleeve Friction. Analysis of results suggests that three main determinants of snow's physical behaviour: its strength, density, and microstructure, can potentially all be obtained via this one test - the CPT.
Graziella Maria Faquim Jannuzzi - One of the best experts on this subject based on the ideXlab platform.
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Penetration and retrieval forces during sampling in a very soft clay
Soils and Foundations, 2021Co-Authors: Graziella Maria Faquim Jannuzzi, Fernando Artur Brasil Danziger, Ian Schumann Marques Martins, Tom LunneAbstract:Abstract Three series of sampling with thin-walled samplers, with and without inside clearance and without a piston, have been performed in a very soft organic clay deposit. The penetration and retrieval forces were measured throughout the operation, thus contributing to a clearer understanding of the sampling process. The measured forces show the importance of proper borehole cleaning conditions, and also identify when samples were lost during retrieval. This occurs when the underpressure at the sampler bottom does not appear in the retrieval force versus time chart. The obtained values have been compared to the Sleeve Friction measured by piezocone tests. Direct simple shear (DSS) tests and vane shear tests have been used as references to back-calculate the dimensionless skin Friction factor from both sample penetration and retrieval. The measurement of force during sampling proved useful for controlling sampling operation, also providing further information with respect to the regular procedure.
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
Fernando Artur Brasil Danziger - One of the best experts on this subject based on the ideXlab platform.
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Penetration and retrieval forces during sampling in a very soft clay
Soils and Foundations, 2021Co-Authors: Graziella Maria Faquim Jannuzzi, Fernando Artur Brasil Danziger, Ian Schumann Marques Martins, Tom LunneAbstract:Abstract Three series of sampling with thin-walled samplers, with and without inside clearance and without a piston, have been performed in a very soft organic clay deposit. The penetration and retrieval forces were measured throughout the operation, thus contributing to a clearer understanding of the sampling process. The measured forces show the importance of proper borehole cleaning conditions, and also identify when samples were lost during retrieval. This occurs when the underpressure at the sampler bottom does not appear in the retrieval force versus time chart. The obtained values have been compared to the Sleeve Friction measured by piezocone tests. Direct simple shear (DSS) tests and vane shear tests have been used as references to back-calculate the dimensionless skin Friction factor from both sample penetration and retrieval. The measurement of force during sampling proved useful for controlling sampling operation, also providing further information with respect to the regular procedure.
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
Elisabeth De Campos Porto - One of the best experts on this subject based on the ideXlab platform.
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
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The Development of the Torpedo-Piezocone
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 1, 2010Co-Authors: Elisabeth De Campos Porto, Cipriano José De Medeiros Junior, Paulo Roberto Dionysio Henriques Junior, Diego Foppa, Antoˆnio Carlos Pimentel Ferreira, Rachel Guerreiro Basi´lio Costa, Jane V. V. Fernandes, Fernando Artur Brasil Danziger, Graziella Maria Faquim Jannuzzi, Gustavo Vaz De Mello Guimara¯esAbstract:The paper describes the development of a soil investigation equipment, consisted of a piezocone installed at the tip of a torpedo-pile. The new equipment, named torpedo-piezocone, is able to measure cone resistance (qc ), Sleeve Friction (fs ), pore-pressure at the cone face (u1 ) and cone shoulder (u2 ) as well as cone temperature during free-fall and some time after final stop. Velocity, as well as displacement (depth) are obtained from accelerometer data, as in the case of the torpedo-pile. The various steps to develop the equipment are presented, from the requirements of the transducers until the calibration procedures in the laboratory. The first tests performed onshore are also presented. In general, very good results have been obtained.Copyright © 2010 by ASME
