The paper presents studies of the energy characteristic of sea ice strength εθ, which does adequately account for physical properties and process of its failure at a dynamic indentation a solid body in it. The mathematical model depicting the process of sea ice failure after contact with a body surface is proposed. The model is grounded on assumptions of the cyclic process of layer-by-layer failure of a half-space from ice at an indentation a rigid body into it. The results of experimental studies are reduced, which one have affirmed a hypothesis about cyclic nature of the failure process of ice block on interface. It was shown, that the magnitude εθ can be considered as constant magnitude for sea ice and can be used in load calculations on offshore structures as the ice strength characteristic.


The field observations of ice failure after moving ice field contact of a with a vertical face of offshore structure demonstrate that this process has dynamic nature and can be developed variously, depending on the several factors: ice temperatures, ice sheet thickness square, and also speed (Tsuprik, 1992). One of alternatives of the ice-structure interaction process is progressing at the definite ratios of the indicated factors can be ice floe splitting, in other cases there is penetration or sometimes ice floe stops near the structure. But in all cases of interaction there is failure. According to the analysis method of maximum ice load on the structure for design specific load the ultimate ice pres-sure, at which it is broken down, is accepted. It mean that the strength ice index is baseline magnitude for definition of the ice load on structure. Nowadays standard ice strength characteristic is uniaxial compressive strength of cubical samples. It is widely applied in designing practice of all countries.

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