Volume expansion of a 413.5-m Mizuho core after its recovery
The density of the core samples was measured soon after their recovery, and the measurement was repeated 1,3,6 and 27 months later. It was found that the density decreased significantly with time. The decreasing rate increased with depth, and decreased with time. The data have been analyzed on the b...
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Department of Applied Physics, Faculty of Engineering, Hokkaido University
1986
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ftnipr:oai:nipr.repo.nii.ac.jp:00002079 2023-05-15T17:10:59+02:00 Volume expansion of a 413.5-m Mizuho core after its recovery Masayoshi Nakawo 1986-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2079 http://id.nii.ac.jp/1291/00002079/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2079&item_no=1&attribute_id=18&file_no=1 en eng Department of Applied Physics, Faculty of Engineering, Hokkaido University https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2079 http://id.nii.ac.jp/1291/00002079/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 45, 78-85(1986-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2079&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1986 ftnipr 2022-11-12T19:42:52Z The density of the core samples was measured soon after their recovery, and the measurement was repeated 1,3,6 and 27 months later. It was found that the density decreased significantly with time. The decreasing rate increased with depth, and decreased with time. The data have been analyzed on the basis of a stress-strain relationship, ε=K(Δp)^n, where ε is the strain rate and Δp is the difference between the pressures of contained bubbles and of the atmosphere. It was found that n≈3,which is a generally accepted value. The value of K was found, on the other hand, of the order of (10)^<-10> s^<-1> MPa^<-3> for a temperature of -10℃, which is much smaller than those obtained previously under deviated stress conditions. Report Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Mizuho ENVELOPE(44.317,44.317,-70.683,-70.683) |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
description |
The density of the core samples was measured soon after their recovery, and the measurement was repeated 1,3,6 and 27 months later. It was found that the density decreased significantly with time. The decreasing rate increased with depth, and decreased with time. The data have been analyzed on the basis of a stress-strain relationship, ε=K(Δp)^n, where ε is the strain rate and Δp is the difference between the pressures of contained bubbles and of the atmosphere. It was found that n≈3,which is a generally accepted value. The value of K was found, on the other hand, of the order of (10)^<-10> s^<-1> MPa^<-3> for a temperature of -10℃, which is much smaller than those obtained previously under deviated stress conditions. |
format |
Report |
author |
Masayoshi Nakawo |
spellingShingle |
Masayoshi Nakawo Volume expansion of a 413.5-m Mizuho core after its recovery |
author_facet |
Masayoshi Nakawo |
author_sort |
Masayoshi Nakawo |
title |
Volume expansion of a 413.5-m Mizuho core after its recovery |
title_short |
Volume expansion of a 413.5-m Mizuho core after its recovery |
title_full |
Volume expansion of a 413.5-m Mizuho core after its recovery |
title_fullStr |
Volume expansion of a 413.5-m Mizuho core after its recovery |
title_full_unstemmed |
Volume expansion of a 413.5-m Mizuho core after its recovery |
title_sort |
volume expansion of a 413.5-m mizuho core after its recovery |
publisher |
Department of Applied Physics, Faculty of Engineering, Hokkaido University |
publishDate |
1986 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2079 http://id.nii.ac.jp/1291/00002079/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2079&item_no=1&attribute_id=18&file_no=1 |
long_lat |
ENVELOPE(44.317,44.317,-70.683,-70.683) |
geographic |
Mizuho |
geographic_facet |
Mizuho |
genre |
Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2079 http://id.nii.ac.jp/1291/00002079/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 45, 78-85(1986-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2079&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766067792018145280 |