Author(s): S. M. Kovalev; V. G. Korostelev; V. A. Nikitin; V. N. Smirnov; A. I. Shushlebin
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Abstract: Results of the tests of practically fresh ice with a borehole jack in the north-west part of the Caspian Sea in February 2003 and of fresh ice in the middle part of the Ob Bay in May 2003 are discussed. The deformation and failure mechanisms of ice by indentor at the different stages of loading in the borehole are studied. The local strength exceeded uniaxial compressive strength of ice samples in 3.8 times for the Caspian Sea and in 4.6 times for the Ob Bay. It is suggested to use a borehole jack for anisotropy determination of ice strength in azimuthal plane. The control of cracking processes in ice cover was carried out with seismoacoustic devices. The configuration and crushing zones sizes, friction angles and cohesion of these zones with ice cover are determined.
Year: 2004