No abstract

In cold region, given that first-year ice ridges often govern the design load for offshorestructure, it is important to obtain knowledge about ice ridges, especially the consolidated layer, indesigning offshore structures. Up to now, the physical properties and strength of sea ice ridge appear to be muchmore complex than those of under formed ice or level ice. In this study, we performed a preliminary series oftests (uniaxial compression tests) in the laboratory on model ice (refrozen rubble) to investigate thestrength and physical properties of the consolidated layer. In order to construct the consolidated layer model, cubical ice blocks of size were randomlyarranged in the ice tank filed with saline water that had greater salinity than that of the ice blocks. After theywere refrozen, we collected core sample from consolidated layer model by cylindrical drills with variousdiameters. And we performed the uniaxial compressive test with various combinations of core diameters and representativelength of ice block. In addition, we performed test by changing the strain rate and room temperature, when d=100mm,a=42.5mm.

In cold region, the design load for offshore structures is often given by first-year ice ridges , it isimportant to obt ain knowledge about ice ridge, especially consolidated parts , in designing offshore structures. However, the physical properties and strength of sea ice ridge appear to be much more complex than those of undeformed ice or level ice.We performed a preliminary series of tests(unconfined compression tests) in the laboratory to investigate the strength and the physical properties of the consolidated part . In order to construct an ice ridge, cubic ice blocks of varies size (a) were place in the ice tank filled with salt water that had greater salinity than that of the ice blocks. After they were refrozen , using varies size core drill (d), we collected core test samples of varies sizes and various d/a ratio , due to combination (a) and (d). and then we examined its physical properties and its strength characteristics in considerations with the size effects .

In cold region, the design ice load for offshore structures is often given by first-year ice ridges, it is important to obtain knowledge about ice ridge, especially consolidated parts, in designing offshore structures. However, the physical properties and strength of sea ice ridge appear to be much more complex than those of undeformed ice or level ice. The authors conducted a preliminary series of tests (uniaxial compression tests) in the laboratory to investigate the strength and the physical properties of the consolidated part. In order to construct an ice ridge, cubic ice blocks of varies size (a) were place in the ice tank filled with salt water that had greater salinity than that of the ice blocks. After they were refrozen, using varies size core drill (d), we collected core test samples of varies sizes and various d/a ratio, due to combination (a) and (d). and then we examined its physical properties and its strength characteristics in considerations with the size effects.