Flexural and compressive strength of the landfast sea ice in the Prydz Bay, East Antarctic
-
Published:2022-05-20
Issue:5
Volume:16
Page:1941-1961
-
ISSN:1994-0424
-
Container-title:The Cryosphere
-
language:en
-
Short-container-title:The Cryosphere
Author:
Wang Qingkai,Li Zhaoquan,Lu Peng,Xu Yigang,Li Zhijun
Abstract
Abstract. A total of 25 flexural and 55 uniaxial compressive
strength tests were conducted in laboratory using landfast sea ice samples
collected in the Prydz Bay. Three-point bending tests were performed at ice
temperatures of −12 to −3 ∘C with force applied vertically
to original ice surface, and compressive strength tests were performed at
−3 ∘C with a strain-rate level of 10−6–10−2 s−1 in the directions vertical and horizontal to ice surface. Judging
from crystal structure, the ice samples were divided into congelation ice,
snow ice, and a mixture of the two. The results of congelation ice
showed that the flexural strength had a decreasing trend depending on
porosity rather than brine volume, based on which a mathematical equation
was established to estimate flexural strength. Both flexural strength and
effective modulus of elasticity increased with increasing platelet spacing.
The uniaxial compressive strength increased and decreased with strain rate
below and above the critical regime, respectively, which is 8.0 × 10−4–1.5 × 10−3 s−1 for vertically loaded samples
and 2.0 × 10−3–3.0 × 10−3 s−1 for
horizontally loaded samples. A drop-off in compressive strength was shown
with increasing sea ice porosity. Consequently, a model was developed to
depict the combined effects of porosity and strain rate on compressive
strength in both ductile and brittle regimes. The mechanical strength of
mixed ice was lower than congelation ice, and that of snow ice was much
weaker. To provide a safe guide for the transportation of goods on landfast
sea ice in the Prydz Bay, the bearing capacity of the ice cover is estimated
with the lower and upper envelopes of flexural strength and effective
elastic modulus, respectively, which turned out to be a function of sea ice
porosity.
Funder
Liaoning Revitalization Talents Program Fundamental Research Funds for the Central Universities National Natural Science Foundation of China
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
Reference42 articles.
1. Arakawa, M. and Maeno, N.: Mechanical strength of polycrystalline ice under
uniaxial compression, Cold Reg. Sci. Technol., 26, 215–226,
https://doi.org/10.1016/S0165-232X(97)00018-9, 1997. 2. Arctic Council: Arctic Marine Shipping Assessment 2009 Report, second printing, Arctic Council, https://oaarchive.arctic-council.org/handle/11374/54 (last access: 18 May 2022), 2009. 3. Bonath, V., Edeskär, T., Lintzén, N., Fransson, L., and Cwirzen, A.:
Properties of ice from first-year ridges in the Barents Sea and Fram Strait,
Cold Reg. Sci. Technol., 168, 102890,
https://doi.org/10.1016/j.coldregions.2019.102890, 2019. 4. Carnat, G., Papakyriakou, T., Geilfus, N. X., Brabant, F., Delille, B.,
Vancoppenolle, M., Gilson, G., Zhou, J., and Tison, J.: Investigations on
physical and textural properties of Arctic first-year sea ice in the
Amundsen Gulf, Canada, November 2007–June 2008 (IPY-CFL system study), J.
Glaciol., 59, 819–837, https://doi.org/10.3189/2013JoG12J148, 2013. 5. Clem, K. R., Fogt, R. L., Turner, J., Lintner, B. R., Marshall, G. J.,
Miller, J. R., and Renwick, J. A.: Record warming at the South Pole during
the past three decades, Nat. Clim. Change, 10, 762–770,
https://doi.org/10.1038/s41558-020-0815-z, 2020.
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|