Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests
The friction angle of sand in the nearshore zone of Cannon Beach, Yakutat, Alaska, was estimated from the deceleration measured by a portable free-fall penetrometer (PFFP) at 72 test locations. A correlation between the relative density and PFFP’s maximum deceleration was developed from controlled P...
Published in: | Canadian Geotechnical Journal |
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Online Access: | http://dx.doi.org/10.1139/cgj-2018-0267 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cgj-2018-0267 http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2018-0267 |
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crcansciencepubl:10.1139/cgj-2018-0267 2024-06-23T07:57:25+00:00 Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests Albatal, Ali Stark, Nina Castellanos, Bernardo 2020 http://dx.doi.org/10.1139/cgj-2018-0267 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cgj-2018-0267 http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2018-0267 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Geotechnical Journal volume 57, issue 1, page 17-31 ISSN 0008-3674 1208-6010 journal-article 2020 crcansciencepubl https://doi.org/10.1139/cgj-2018-0267 2024-06-13T04:10:50Z The friction angle of sand in the nearshore zone of Cannon Beach, Yakutat, Alaska, was estimated from the deceleration measured by a portable free-fall penetrometer (PFFP) at 72 test locations. A correlation between the relative density and PFFP’s maximum deceleration was developed from controlled PFFP deployments into sand of different relative densities. Two approaches were tested: (i) a correlation between relative density and friction angle and (ii) bearing capacity theory. For the former, laboratory vacuum triaxial tests were performed to adjust an existing correlation between relative density and friction angle for the tested nearshore sediments. In situ peak friction angles were then determined using this adjusted correlation and estimates of relative densities. The resulting in situ relative density and friction angle varied between 32%–88% and 44°–56°, respectively. Two bearing capacity–based methods suitable for shallow penetrations were tested. For this approach, equivalents of static cone resistance were determined from the measured decelerations considering the strain rate effect. A range of empirical strain rate coefficients K = 0.1–1.5 were tested. A K value between 0.2 and 0.4 yielded matching results between the two approaches. The estimated friction angles agreed well with expected values and may be applied to problems of sediment transport or early site assessment. Article in Journal/Newspaper Yakutat Alaska Canadian Science Publishing Canadian Geotechnical Journal 57 1 17 31 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
The friction angle of sand in the nearshore zone of Cannon Beach, Yakutat, Alaska, was estimated from the deceleration measured by a portable free-fall penetrometer (PFFP) at 72 test locations. A correlation between the relative density and PFFP’s maximum deceleration was developed from controlled PFFP deployments into sand of different relative densities. Two approaches were tested: (i) a correlation between relative density and friction angle and (ii) bearing capacity theory. For the former, laboratory vacuum triaxial tests were performed to adjust an existing correlation between relative density and friction angle for the tested nearshore sediments. In situ peak friction angles were then determined using this adjusted correlation and estimates of relative densities. The resulting in situ relative density and friction angle varied between 32%–88% and 44°–56°, respectively. Two bearing capacity–based methods suitable for shallow penetrations were tested. For this approach, equivalents of static cone resistance were determined from the measured decelerations considering the strain rate effect. A range of empirical strain rate coefficients K = 0.1–1.5 were tested. A K value between 0.2 and 0.4 yielded matching results between the two approaches. The estimated friction angles agreed well with expected values and may be applied to problems of sediment transport or early site assessment. |
format |
Article in Journal/Newspaper |
author |
Albatal, Ali Stark, Nina Castellanos, Bernardo |
spellingShingle |
Albatal, Ali Stark, Nina Castellanos, Bernardo Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
author_facet |
Albatal, Ali Stark, Nina Castellanos, Bernardo |
author_sort |
Albatal, Ali |
title |
Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
title_short |
Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
title_full |
Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
title_fullStr |
Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
title_full_unstemmed |
Estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
title_sort |
estimating in situ relative density and friction angle of nearshore sand from portable free-fall penetrometer tests |
publisher |
Canadian Science Publishing |
publishDate |
2020 |
url |
http://dx.doi.org/10.1139/cgj-2018-0267 http://www.nrcresearchpress.com/doi/full-xml/10.1139/cgj-2018-0267 http://www.nrcresearchpress.com/doi/pdf/10.1139/cgj-2018-0267 |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_source |
Canadian Geotechnical Journal volume 57, issue 1, page 17-31 ISSN 0008-3674 1208-6010 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/cgj-2018-0267 |
container_title |
Canadian Geotechnical Journal |
container_volume |
57 |
container_issue |
1 |
container_start_page |
17 |
op_container_end_page |
31 |
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1802651054807973888 |