Abstract
The article presents analysis of results of seismic liquefaction assessment of soils distributed in the southern part of the Barents Sea. Studies of the tendency of seabed soils to liquefaction were carried out as part of the engineering-geological surveys for the construction of production facilities of the Shtokman gas-condensate field (ShGKF). A review of similar studies carried out in seismically hazardous areas of the Black Sea, the Sea of Azov and the Sea of Okhotsk is given. It is noted that formation of seismic deformations caused by liquefaction of soils is very dangerous for oil and gas production facilities both onshore and offshore. The dynamic stability of soils in the southern area of the Barents Sea was performed based on the results of cone penetration testing and calculation of seismic liquefaction potential. It is shown that the studied clay and sandy soils of the foundations of the ShGKF project facilities, on the basis of cone penetration testing, are not prone to liquefaction under the seismic loads typical for the southern part of the Barents Sea. At the same time values of seismic liquefaction potential indicate the possibility of coastal sandy soils transition to fluid state for earthquakes of 7,7 intensity according to the MSK-64 scale. It is recommended to predict the danger of liquefaction of these soils by dynamic properties laboratory determination.
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