Compressive and Shear Strengths of Fragmented Ice Covers-a Laboratory Study.

• Main Authors: Cheng,S T, Tatinclaux,J C
• Other Authors: IOWA INST OF HYDRAULIC RESEARCH IOWA CITY
• Format: Text
• Language: English
• Published: 1977
• Subjects: Snow; Ice and Permafrost; Civil Engineering; Mechanics; *ICE; TEMPERATURE; THICKNESS; STRESS ANALYSIS; WATER; LOADS(FORCES); ATMOSPHERIC TEMPERATURE; THESES; POROSITY; STRENGTH(MECHANICS); MODEL TESTS; RIVERS; AIR WATER INTERACTIONS; FRAGMENTS; COMPRESSIVE PROPERTIES; COHESION; FLOATING BODIES; SHEAR STRENGTH; *Ice jams; Ice cover; River ice; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/ADA045246; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA045246

The results of an experimental study on the compressive and shear strengths of floating, fragmented ice covers are presented. The compressive strength of prestrained covers and of covers submitted to an approximately constant preload was found to be essentially equal to that of unstrained, non-preloaded covers. The compressive strength (sigma cr) became independent of the velocity (Vc) at which the load was applied when Vc became greater than 0.01 ft/sec, and for Vc 0.01 the ratio of strength to cover thickness (t) and the shear strength (tau) became, approximately constant independent of both vc and t. Differences observed between the present study and that of a previous similar investigation led to the conclusion that small variations in the air and/or water temperatures can have a large effect on sigma cr, and sigma cr/t, probably due to their affecting the formation of cohesive bonds between the ice particles within the ice covers. (Author)