ABSTRACT:

Uniaxial compressive strength is one of the main parameters that determines the ice load acting on structures. The properties of sea ice vary according to the maritime and weather conditions, and they strongly depend on regionality. This paper aims to clarify the characteristics of uniaxial compressive strength of sea ice along the coast of Hokkaido and Sakhalin through the comparative study of existing formula of Weeks and Assur's, Timco and Frederking's, Truskov's and experimental results of the authors.

INTRODUCTION

More than 30 different ice load formula have been proposed for designing offshore and maritime structures in ice-infested sea. However, these properties of sea ice depend on its consolidation process and history, which vary according to regional conditions such as maritime and weather conditions. So, the proposed formula were for Arctic ice and could not be applied to the calculation of ice load in other region without first confirming their applicability. Off the northeastern coast of Sakhalin Island in the Okhotsk Sea, exploitation of oil and natural gas is currently underway. This project is the first-ever, full-scale exploitation in the offshore of the Okhotsk Sea, which requires the facilities and structures in ice-infested water. Therefore, it is necessary to determine the applicability of the formula and parameters on uniaxial compressive strength of sea ice in the Okhotsk Sea. On the other hand, in the calculation of ice load, the average value of uniaxial compressive strength is used for ice load formula, in general. However, it is known that the strength of natural sea ice varies widely for sea ice grown under similar conditions. In order to take into account the dispersion of uniaxial compressive strength of sea ice for calculating ice load, it is necessary to clarify the probability features of the strength.

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