Preprints
https://doi.org/10.5194/tc-2021-389
https://doi.org/10.5194/tc-2021-389

  10 Jan 2022

10 Jan 2022

Review status: this preprint is currently under review for the journal TC.

Flexural and compressive strength of the landfast sea ice in the Prydz Bay, East Antarctic

Qingkai Wang1, Zhaoquan Li1, Peng Lu1, Yigang Xu2, and Zhijun Li1 Qingkai Wang et al.
  • 1State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China
  • 2Marine Design and Research Institute of China, Shanghai, 200011, China

Abstract. A total of 25 flexural and 55 uniaxial compressive strength tests were conducted 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 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 these 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 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 modulus, respectively, which turned out to be a function of sea ice porosity.

Qingkai Wang et al.

Status: open (until 07 Mar 2022)

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Data sets

Flexural and compressive strength of the landfast sea ice in the Prydz Bay, East Antarctic Qingkai Wang, Zhaoquan Li, Peng Lu, Zhijun Li https://doi.org/10.5281/zenodo.5787915

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Short summary
A large area of landfast sea ice exists in the Prydz Bay, and it is always a safety concern to transport cargos on ice to the research stations. Knowing the mechanical properties of sea ice is helpful to solve the issue; however, these data are rarely reported in this region. We explore the effects of sea ice physical properties on the flexural strength, effective modulus, and uniaxial compressive strength, which gives new insights into assessing the bearing capacity of landfast sea ice cover.