Из опыта оценки сейсмической разжижаемости грунтов оснований якорей полупогружных буровых установок с помощью динамических трехосных испытаний

The article gives a brief overview of the problem of seismic liquefaction capability of sea bottom soils. The liquefaction hazard of foundation soils of offshore platforms and pipelines is shown. Assessment results of seismic stability of disperse deposits in two areas in the Tuapse depression (Black sea) obtained by laboratory dynamic triaxial tests are presented. Kinds of potentially liquefiable soils are revealed in those areas. The described case history showed that for installation of anchored sea structures the possibility of anchor foundation soil liquefaction should be assessed. In addition, it was shown that sapropels can liquefy during strong earthquakes. These findings can be useful for specialists in the field of engineering support of search and exploration of hydrocarbon deposits and for installation of drilling rigs of temporary type on the sea shelf.