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Indexed by:期刊论文

Date of Publication:2011-09-01

Journal:SCIENCE CHINA-TECHNOLOGICAL SCIENCES

Included Journals:Scopus、SCIE、EI

Volume:54

Issue:9

Page Number:2429-2436

ISSN No.:1674-7321

Key Words:sea ice; ice problems; ice control; compressive strength; measurements; parameter estimation

Abstract:For the abnormal ice condition in 2009-2010 winter, sea ice samples were collected in a tide ditch outside a port in the east coast of Liaodong Bay, and ice specimens were prepared. Experimental study was carried out with a temperature-control precision of 0.1A degrees C, and 117 columnar-grained ice specimens were loaded along the direction parallel to ice surface under different test temperatures (-4, -7, -10, -13, -16A degrees C) and strain rates ranging from 10(-6) to 10(-2) s(-1) within which the ductile region, ductile-brittle transition and brittle region are contained. The uniaxial compressive strengths, density and salinity of the ice specimens were measured. The results support the curved-surface relationship between the uniaxial compressive strength and porosity within a wide range of strain rate. The curved-surface relationship gives a quantitative description about the variations of the mechanical behavior transition point with ice porosity, and supplies a uniform mathematical representation of uniaxial compressive strength under different failure modes. Besides, it is deduced that abnormal ice condition in 2009-2010 winter will not result in a change of the uniaxial compressive strength of sea ice in Bohai Sea.